Simplify CircleCI build, less configuration, remove macOS build (#2051)

* Simplify CircleCI build, less configuration, remove macOS build
* Automatically build release when tag is pushed
* Build image tarballs when not prerelease
* Try to do less homebrew and make all commands quieter
* Add the org_global restricted context to release buld
* Update docs and remove trigger_release.sh

.circleci/README.md

@@ -1,31 +1,5 @@
 # CircleCI Script Usage
 
-## Tags build automatically
+## Tags/Releases build automatically
 
 If you just push a tag, circleci will build that tag and make its artifacts available both on CircleCI and by creating a GitHub release draft containing the artifacts. This is a result of the tag_build *workflow*, which calls the job.
-
-## Push a release with trigger_release.sh
-
-`.circleci/trigger_release.sh --release-tag=v1.7.1 --circleci-token=circleToken900908b3443ea58316baf928b --github-token=githubPersonalToken853ae6f72c40525cd21036f742904a   --windows-signing-password=windowscodepassword | jq -r 'del(.circle_yml)'  | jq -r 'del(.circle_yml)'`
-
-## trigger_job.sh options
-
-trigger_job.sh can be used to trigger *jobs* but not workflows. As our Circleci strategy is mostly built around workflows, this is less useful than it used to be.
-
-.circleci/trigger_job.sh <circle_token> tag_build drud/ddev <optional_branch> <github_personal_access_token>  <release_tag>  | jq -r
-
-trigger_job.sh can trigger a nightly or a normal build. It triggers *jobs* not workflows.
-
-It always requires a circle token for the second argument, and by default will run the main build workflow:
-
-* trigger normal build:
-`.circleci/trigger_job.sh 0123456773884887377aabvb `
-
-* trigger nightly build in drud/ddev (default):
-`.circleci/trigger_job.sh 0123456773884887377aabvb nightly_build`
-
-* trigger nightly using rfay/ddev master branch (testing must be enabled on rfay/ddev):
-`.circleci/trigger_job.sh 0123456773884887377aabvb nightly_build rfay/ddev`
-
-* trigger nightly on rfay/ddev on branch 20170803_workflows_contexts:
-`.circleci/trigger_job.sh 0123456773884887377aabvb nightly_build rfay/ddev 20170803_workflows_contexts`