Bazel CI

[shameekganguly]

🎉 New feature

Summary

Adds CI for bazel build and tests.

Checklist

• [x] Signed all commits for DCO
• [ ] Added tests
• [ ] Added example and/or tutorial
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [ ] codecheck passed (See contributing)
• [ ] All tests passed (See test coverage)
• [ ] While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[scpeters]

should we make any of these bazel CI builds required for sdf15 and main branches?

[mjcarroll]

should we make any of these bazel CI builds required for sdf15 and main branches?

I don't have any strong reason not to. It would keep the bazel build files up-to-date. The CI runs pretty quickly and is unobtrusive for the most part. If something fails in bazel, it's probably also failing in other places.