Can't push to GCR

[AkihiroSuda]

Description

Can't push to GCR.

This is likely to be an issue on GCR side.

Steps to reproduce the issue:

Push to GCR

Describe the results you received:

$ docker app push ./example-voting-app.dockerapp --platform linux/amd64 -t gcr.io/foo/bar

gcr.io/foo/bar
postgres:9.4
 application/vnd.docker.distribution.manifest.list.v2+json [1/1] (sha256:4d915cbb...)
dockersamples/examplevotingapp_vote:before
 application/vnd.docker.distribution.manifest.v2+json [8/8] (sha256:8e64b18b...)
dockersamples/examplevotingapp_result:before
 application/vnd.docker.distribution.manifest.v2+json [16/16] (sha256:83b56899...)
dockersamples/examplevotingapp_worker
 application/vnd.docker.distribution.manifest.v2+json [10/10] (sha256:55753a7b...)
redis:alpine
 application/vnd.docker.distribution.manifest.list.v2+json [1/1] (sha256:98547c35...)
WARN[0141] reference for unknown type: application/vnd.cnab.config.v1+json
pushing to "gcr.io/foo/bar:latest": error while pushing bundle config manifest: unexpected status: 400 Bad Request

Describe the results you expected:
Should success

Output of docker-app version:

Version:               v0.8.0
Git commit:            7eea32b7
Built:                 Tue Jun 11 20:53:26 2019
OS/Arch:               linux/amd64
Experimental:          off
Renderers:             none
Invocation Base Image: docker/cnab-app-base:v0.8.0

[thaJeztah]

is this similar to the workaround that was added in buildkit?

[silvin-lubecki]

Thank you @AkihiroSuda for filling this issue 👍

[thaJeztah]

Oh, ignore my comment; I saw notifications for #563 and this one, and thought this one was about authentication 🤦‍♂