fix (build): Add Bazel Steward

[vorburger]

Relates to #254.

[gemini-code-assist]

Hello @vorburger, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

Summary of Changes

This pull request adds Bazel Steward to the project, as related to issue #254. It introduces a .bazel-steward.yaml file to configure Bazel Steward for Maven dependency updates. It also adds a tools/bazel-steward/update.bash script to launch Bazel Steward. Finally, it adds a TODO comment to .github/dependabot.yml.

Highlights

• Bazel Steward Configuration: Adds .bazel-steward.yaml to configure Bazel Steward for Maven dependency management, specifying the repository name.
• Bazel Steward Update Script: Introduces tools/bazel-steward/update.bash to execute Bazel Steward, using coursier to launch the steward.
• Dependabot Configuration: Adds a TODO comment to .github/dependabot.yml regarding a Dependabot issue.

Changelog

• .bazel-steward.yaml
  • Added a new file to configure Bazel Steward for Maven dependency updates.
  • Specifies the repository name as enola_maven.
• .github/dependabot.yml
  • Added a TODO comment referencing a Dependabot issue.
• tools/bazel-steward/update.bash
  • Added a new script to launch Bazel Steward using coursier.
  • Uses bazel-steward version 1.6.0.

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Trivia time!

What is Coursier, the tool used in the update.bash script to launch Bazel Steward?

Click here for the answer

Coursier is a dependency resolver and package fetcher for Scala and Java. It is used to resolve and fetch the dependencies required to run Bazel Steward.

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[gemini-code-assist]

Code Review

This pull request adds Bazel Steward to the project, which automates dependency updates. The changes include adding a Bazel Steward configuration file, updating the Dependabot configuration, and adding a script to run Bazel Steward. Overall, the changes seem reasonable, but there are a few areas that could be improved.

Summary of Findings

• TODO comments: The pull request introduces TODO comments in .github/dependabot.yml and tools/bazel-steward/update.bash. Consider addressing these or providing more context on when they will be addressed.
• Coursier installation: The tools/bazel-steward/update.bash script uses cs launch, but it's unclear where Coursier is installed or how it's managed. Clarify this in the script or documentation.

Merge Readiness

The pull request introduces Bazel Steward to automate dependency updates, which is a valuable addition. However, the TODO comments and the unclear Coursier installation should be addressed before merging. I am unable to directly approve this pull request, and recommend that others review and approve this code before merging.

[gemini-code-assist]

The TODO comment mentions Coursier. It would be helpful to provide more information on how Coursier is installed or managed, perhaps with a comment or link to documentation.

Suggested change

	# TODO And where does coursier come from?! ;-)
	# TODO And where does coursier come from?! ;-) Consider using https://github.com/coursier/setup-action to install it, or document where it's expected to be installed.

[vorburger]

This is now at a state where it works well enough to already be useful.

It just created https://github.com/enola-dev/enola/branches/all?query=bazel-steward.

VirtusLab/bazel-steward#44 would be quite cool, but is not a reason to hold off.

VirtusLab/bazel-steward#403 turned out to be (very) confusing, but not as blocking as I thought at first.

Triggering this by a GitHub Action is still TBD, but will be separate.