Add CI workflow for build and test

[EdwardPalmer99]

Set up CI workflow for building and testing the project using Bazel.

[Copilot]

Pull request overview

Adds a GitHub Actions CI workflow intended to build and run unit tests with Bazel on pushes and pull requests.

Changes:

• Introduces a new GitHub Actions workflow under .github/workflows/.
• Runs bazel build //... --config=release.
• Runs bazel test //... --config=release.

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[Copilot]

This workflow only runs for pushes/PRs on the master branch. If you want CI to validate PRs from any branch (common for feature branches), consider removing the branches filter under pull_request, and/or triggering pushes on the repository’s default branch (often main).

Suggested change

	branches: [ "master" ]
	pull_request:
	branches: [ "master" ]
	branches: [ "main" ]
	pull_request:

[Copilot]

For supply-chain safety, consider pinning GitHub Actions (e.g., actions/checkout and bazel-contrib/setup-bazel) to a commit SHA instead of a mutable tag like @v4 / @0.14.0. This reduces the risk of an upstream tag being moved to unexpected code.

Suggested change

	- uses: actions/checkout@v4
	- uses: bazel-contrib/setup-bazel@0.14.0
	- uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
	- uses: bazel-contrib/setup-bazel@4d953e67229547324f8a156392c767bdafa5df42 # 0.14.0

[Copilot]

steps: is not indented correctly. As written, the - uses: entries are siblings of steps rather than elements of the steps array, which will make the workflow YAML invalid (or the job have no steps). Indent each - ... under steps:.

Suggested change

	- uses: actions/checkout@v4
	- uses: bazel-contrib/setup-bazel@0.14.0
	with:
	# Avoid downloading Bazel every time.
	bazelisk-cache: true
	# Store build cache per workflow.
	disk-cache: ${{ github.workflow }}
	# Share repository cache between workflows.
	repository-cache: true
	- name: Build
	run: bazel build //... --config=release
	- name: Unit Tests
	run: bazel test //... --config=release
	- uses: actions/checkout@v4
	- uses: bazel-contrib/setup-bazel@0.14.0
	with:
	# Avoid downloading Bazel every time.
	bazelisk-cache: true
	# Store build cache per workflow.
	disk-cache: ${{ github.workflow }}
	# Share repository cache between workflows.
	repository-cache: true
	- name: Build
	run: bazel build //... --config=release
	- name: Unit Tests
	run: bazel test //... --config=release