Improve Actions hygiene

[sethvargo]

👋 hello there! I'm a fellow Googler who works on projects that leverage GitHub Actions for CI/CD. Recently I noticed a large increase in our queue time, and I've tracked it down to the limit of 180 concurrent jobs for an organization. To help be better citizens, I'm proposing changes across a few repositories that will reduce GitHub Actions hours and consumption. I hope these changes are reasonable and I'm happy to talk through them in more detail.

• Only run GitHub Actions for pushes and PRs against the main branch of the repository. If your team uses a forking model, this change will not affect you. If your team pushes branches to the repository directly, this changes actions to only run against the primary branches or if you open a Pull Request against a primary branch.

• For long-running jobs (especially tests), I added the "Cancel previous" workflow. This is very helpful to prevent a large queue backlog when you are doing rapid development and pushing multiple commits. Without this, GitHub Actions' default behavior is to run all actions on all commits.

There are other changes you could make, depending on your project (but I'm not an expert):

• If you have tests that should only run when a subset of code changes, consider gating your workflow to particular file paths. For example, we have some jobs that do Terraform linting, but they only run when Terraform files are changed.

Hopefully these changes are not too controversial and also hopefully you can see how this would reduce actions consumption to be good citizens to fellow Googlers. If you have any questions, feel free to respond here or ping me on chat. Thank you!

[codecov]

Codecov Report

Merging #1821 (2aafcd3) into master (5a468ce) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1821   +/-   ##
=======================================
  Coverage   97.55%   97.55%           
=======================================
  Files         102      102           
  Lines        6578     6578           
=======================================
  Hits         6417     6417           
  Misses         87       87           
  Partials       74       74           

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[willnorris]

These changes seem totally reasonable (especially since I don't think they will impact this repo much at all), and we could probably simplify things a little further like reducing the size of the build matrix. If you're not already, you should probably also coordinate with @taquitos and @gauntface on broader cleanup efforts (I'm not at Google myself anymore, so don't know if that's already happening).

[sethvargo]

@taquitos and I are in active conversations 😄

[taquitos]

🎈🐐