Update the mirror workflows

[SpectrumFRC3847]

Syncs oss/.github/workflows/ from the private repo.

Summary by CodeRabbit

• Chores
  • Updated the Android build environment to use a specific Java 21 release for more consistent nightly builds.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 152ae845-0805-47f2-8c14-ec4d1883496f

📥 Commits

Reviewing files that changed from the base of the PR and between 3994b72 and d888ba9.

📒 Files selected for processing (1)

• .github/workflows/nightly.yml

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📝 Walkthrough

Walkthrough

The nightly Android workflow now pins Java to 21.0.12+101.0.LTS instead of using the floating Java 21 version.

Changes

Android Java pinning

Layer / File(s)	Summary
Pin nightly Android Java setup .github/workflows/nightly.yml	The Android job now uses Java 21.0.12+101.0.LTS.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sync/nightly-workflow

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