mozilla-releng / balrog / #3277

90%

main: 89%

Pull #2719

circleci

Switch CI to taskgraph

Use taskgraph instead of defining tasks directly in .taskcluster.yml

This requires duplicating the Dockerfiles for backend and agent under
taskcluster/docker/ because of the different expectations for things like
paths.

The push-dockerimage.sh scripts are replaced by a skopeo-based script stolen
from shipit, which uses the image built in a separate task and just overwrites
its version.json, instead of building a completely new image before pushing it
to docker hub.

The balrog-specific taskgraph code is necessary to:
- add a "pull_request_number" decision task parameter
- add a "release" target_tasks method for github-release events
- filter tasks on github-release based on the git tag name (run-on-releases,
  similar to the existing run-on-git-branches)
- pass some params into the push-image script's environment
- pass the pull request number to coveralls via environment

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