Issue: docker: `net/http: HTTP/1.x transport connection broken: unsupported transfer encoding: "identity"`

[fgysin]

I'm running into problems setting up act on my OS X.
I simply executed act for the first time, but that seems to run into connection problems (probably with the docker container):
net/http: HTTP/1.x transport connection broken: unsupported transfer encoding: "identity"

Act version

act --version
  act version 0.2.21

Docker

brew upgrade docker
  Warning: Treating docker as a formula. For the cask, use homebrew/cask/docker
  Warning: docker 20.10.5 already installed

Expected behaviour

Act runs the default task of the given repository.

Actual behaviour

Getting an HTTP transport error.

Workflow and/or repository

I used the default https://github.com/cplee/github-actions-demo...

Steps to reproduce

1. Clone example repo (https://github.com/cplee/github-actions-demo)
2. Enter cloned repo directory
3. Run act

act output

Log

~/projects/github-actions-demo act -v
DEBU[0000] Loading environment from /Users/gysin/projects/github-actions-demo/.env
DEBU[0000] Loading secrets from /Users/gysin/projects/github-actions-demo/.secrets
DEBU[0000] Loading workflows from '/Users/gysin/projects/github-actions-demo/.github/workflows'
DEBU[0000] Reading workflow '/Users/gysin/projects/github-actions-demo/.github/workflows/main.yml'
DEBU[0000] Planning event: push
DEBU[0000] Loading slug from git directory '/Users/gysin/projects/github-actions-demo/.git'
DEBU[0000] Found revision: 2dcabf3769c2613687310c7b71b89af681e8ee50
DEBU[0000] Loading revision from git directory '/Users/gysin/projects/github-actions-demo/.git'
DEBU[0000] Found revision: 2dcabf3769c2613687310c7b71b89af681e8ee50
DEBU[0000] HEAD points to '2dcabf3769c2613687310c7b71b89af681e8ee50'
DEBU[0000] HEAD matches refs/heads/master
DEBU[0000] using github ref: refs/heads/master
DEBU[0000] context env => map[ACT:true]
[CI/test] 🚀  Start image=catthehacker/ubuntu:act-latest
DEBU[0000] Loading slug from git directory '/Users/gysin/projects/github-actions-demo/.git'
DEBU[0000] Found revision: 2dcabf3769c2613687310c7b71b89af681e8ee50
DEBU[0000] Loading revision from git directory '/Users/gysin/projects/github-actions-demo/.git'
DEBU[0000] Found revision: 2dcabf3769c2613687310c7b71b89af681e8ee50
DEBU[0000] HEAD points to '2dcabf3769c2613687310c7b71b89af681e8ee50'
DEBU[0000] HEAD matches refs/heads/master
DEBU[0000] using github ref: refs/heads/master
[CI/test]   🐳  docker pull catthehacker/ubuntu:act-latest
DEBU[0000] Image exists? true
[CI/test] Removed container: 74f17449139163ab38afd95169ab8761c07c7ce44b3467e21e9339b3f1758e55
[CI/test]   🐳  docker volume rm act-CI-test
[CI/test]   🐳  docker create image=catthehacker/ubuntu:act-latest platform=linux/amd64 entrypoint=["/usr/bin/tail" "-f" "/dev/null"] cmd=[]
[CI/test] Created container name=act-CI-test id=fffddf7c1b06e169e11c5ed9bd78870db57b9104c39dd51c0abf2c944fa94a3d from image catthehacker/ubuntu:act-latest (platform: linux/amd64)
[CI/test] ENV ==> [RUNNER_TOOL_CACHE=/opt/hostedtoolcache RUNNER_OS=Linux RUNNER_TEMP=/tmp]
[CI/test]   🐳  docker run image=catthehacker/ubuntu:act-latest platform=linux/amd64 entrypoint=["/usr/bin/tail" "-f" "/dev/null"] cmd=[]
[CI/test] Starting container: fffddf7c1b06e169e11c5ed9bd78870db57b9104c39dd51c0abf2c944fa94a3d
[CI/test] Started container: fffddf7c1b06e169e11c5ed9bd78870db57b9104c39dd51c0abf2c944fa94a3d
[CI/test]   🐳  docker cp src=/Users/gysin/projects/github-actions-demo/. dst=/Users/gysin/projects/github-actions-demo
[CI/test] Exec command '[mkdir -p /Users/gysin/projects/github-actions-demo]'
DEBU[0000] FIXME: Got an status-code for which error does not match any expected type!!!: -1  module=api status_code=-1
DEBU[0000] error during connect: Post "http://%2Fvar%2Frun%2Fdocker.sock/v1.40/exec/72d3e2dd75ee1fb3698895f095335b05e0876d367caf5f91901d7224946c468d/start": net/http: HTTP/1.x transport connection broken: unsupported transfer encoding: "identity"
github.com/nektos/act/pkg/container.(*containerReference).exec.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/container/docker_run.go:425
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.IfNot.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:164
github.com/nektos/act/pkg/common.Executor.If.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:154
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/runner.(*RunContext).startJobContainer.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/runner/run_context.go:143
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.If.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:154
github.com/nektos/act/pkg/runner.(*runnerImpl).NewPlanExecutor.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/runner/runner.go:81
github.com/nektos/act/pkg/common.Executor.ChannelError.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:125
github.com/nektos/act/pkg/common.NewParallelExecutor.func1.1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:101
runtime.goexit
	/usr/local/Cellar/go/1.16.2/libexec/src/runtime/asm_amd64.s:1371
DEBU[0000] error during connect: Post "http://%2Fvar%2Frun%2Fdocker.sock/v1.40/exec/72d3e2dd75ee1fb3698895f095335b05e0876d367caf5f91901d7224946c468d/start": net/http: HTTP/1.x transport connection broken: unsupported transfer encoding: "identity"
github.com/nektos/act/pkg/container.(*containerReference).exec.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/container/docker_run.go:425
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.IfNot.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:164
github.com/nektos/act/pkg/common.Executor.If.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:154
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/runner.(*RunContext).startJobContainer.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/runner/run_context.go:143
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.If.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:154
github.com/nektos/act/pkg/runner.(*runnerImpl).NewPlanExecutor.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/runner/runner.go:81
github.com/nektos/act/pkg/common.Executor.ChannelError.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:125
github.com/nektos/act/pkg/common.NewParallelExecutor.func1.1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:101
runtime.goexit
	/usr/local/Cellar/go/1.16.2/libexec/src/runtime/asm_amd64.s:1371
DEBU[0000] error during connect: Post "http://%2Fvar%2Frun%2Fdocker.sock/v1.40/exec/72d3e2dd75ee1fb3698895f095335b05e0876d367caf5f91901d7224946c468d/start": net/http: HTTP/1.x transport connection broken: unsupported transfer encoding: "identity"
github.com/nektos/act/pkg/container.(*containerReference).exec.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/container/docker_run.go:425
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.IfNot.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:164
github.com/nektos/act/pkg/common.Executor.If.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:154
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/runner.(*RunContext).startJobContainer.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/runner/run_context.go:143
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.If.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:154
github.com/nektos/act/pkg/runner.(*runnerImpl).NewPlanExecutor.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/runner/runner.go:81
github.com/nektos/act/pkg/common.Executor.ChannelError.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:125
github.com/nektos/act/pkg/common.NewParallelExecutor.func1.1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:101
runtime.goexit
	/usr/local/Cellar/go/1.16.2/libexec/src/runtime/asm_amd64.s:1371
DEBU[0000] error during connect: Post "http://%2Fvar%2Frun%2Fdocker.sock/v1.40/exec/72d3e2dd75ee1fb3698895f095335b05e0876d367caf5f91901d7224946c468d/start": net/http: HTTP/1.x transport connection broken: unsupported transfer encoding: "identity"
github.com/nektos/act/pkg/container.(*containerReference).exec.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/container/docker_run.go:425
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.IfNot.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:164
github.com/nektos/act/pkg/common.Executor.If.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:154
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/runner.(*RunContext).startJobContainer.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/runner/run_context.go:143
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.If.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:154
github.com/nektos/act/pkg/runner.(*runnerImpl).NewPlanExecutor.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/runner/runner.go:81
github.com/nektos/act/pkg/common.Executor.ChannelError.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:125
github.com/nektos/act/pkg/common.NewParallelExecutor.func1.1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:101
runtime.goexit
	/usr/local/Cellar/go/1.16.2/libexec/src/runtime/asm_amd64.s:1371
DEBU[0000] error during connect: Post "http://%2Fvar%2Frun%2Fdocker.sock/v1.40/exec/72d3e2dd75ee1fb3698895f095335b05e0876d367caf5f91901d7224946c468d/start": net/http: HTTP/1.x transport connection broken: unsupported transfer encoding: "identity"
github.com/nektos/act/pkg/container.(*containerReference).exec.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/container/docker_run.go:425
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.IfNot.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:164
github.com/nektos/act/pkg/common.Executor.If.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:154
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/runner.(*RunContext).startJobContainer.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/runner/run_context.go:143
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.If.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:154
github.com/nektos/act/pkg/runner.(*runnerImpl).NewPlanExecutor.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/runner/runner.go:81
github.com/nektos/act/pkg/common.Executor.ChannelError.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:125
github.com/nektos/act/pkg/common.NewParallelExecutor.func1.1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:101
runtime.goexit
	/usr/local/Cellar/go/1.16.2/libexec/src/runtime/asm_amd64.s:1371
DEBU[0000] error during connect: Post "http://%2Fvar%2Frun%2Fdocker.sock/v1.40/exec/72d3e2dd75ee1fb3698895f095335b05e0876d367caf5f91901d7224946c468d/start": net/http: HTTP/1.x transport connection broken: unsupported transfer encoding: "identity"
github.com/nektos/act/pkg/container.(*containerReference).exec.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/container/docker_run.go:425
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.IfNot.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:164
github.com/nektos/act/pkg/common.Executor.If.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:154
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/runner.(*RunContext).startJobContainer.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/runner/run_context.go:143
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.If.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:154
github.com/nektos/act/pkg/runner.(*runnerImpl).NewPlanExecutor.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/runner/runner.go:81
github.com/nektos/act/pkg/common.Executor.ChannelError.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:125
github.com/nektos/act/pkg/common.NewParallelExecutor.func1.1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:101
runtime.goexit
	/usr/local/Cellar/go/1.16.2/libexec/src/runtime/asm_amd64.s:1371
DEBU[0000] error during connect: Post "http://%2Fvar%2Frun%2Fdocker.sock/v1.40/exec/72d3e2dd75ee1fb3698895f095335b05e0876d367caf5f91901d7224946c468d/start": net/http: HTTP/1.x transport connection broken: unsupported transfer encoding: "identity"
github.com/nektos/act/pkg/container.(*containerReference).exec.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/container/docker_run.go:425
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.IfNot.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:164
github.com/nektos/act/pkg/common.Executor.If.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:154
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/runner.(*RunContext).startJobContainer.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/runner/run_context.go:143
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:146
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.Then.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:133
github.com/nektos/act/pkg/common.Executor.If.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:154
github.com/nektos/act/pkg/runner.(*runnerImpl).NewPlanExecutor.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/runner/runner.go:81
github.com/nektos/act/pkg/common.Executor.ChannelError.func1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:125
github.com/nektos/act/pkg/common.NewParallelExecutor.func1.1
	/private/tmp/act-20210330-72336-j1hm1j/act-0.2.21/pkg/common/executor.go:101
runtime.goexit
	/usr/local/Cellar/go/1.16.2/libexec/src/runtime/asm_amd64.s:1371
Error: error during connect: Post "http://%2Fvar%2Frun%2Fdocker.sock/v1.40/exec/72d3e2dd75ee1fb3698895f095335b05e0876d367caf5f91901d7224946c468d/start": net/http: HTTP/1.x transport connection broken: unsupported transfer encoding: "identity"

[ChristopherHX]

Maybe try update docker, it seems to be an incompatibility with Docker Desktop older than Edge 2.3.7.0 (48173) and go 1.15+ on mac. See here docker/for-mac#4855.

Or it is worth a try to use docker from https://docs.docker.com/docker-for-mac/release-notes/ and not from brew. Never tried on mac.

Even an old issue here #356

[github-actions]

Issue is stale and will be closed in 14 days unless there is new activity

[catthehacker]

Closing as it's an issue with local Docker installation and relevant information provided above.