Add workflow to auto-merge Dependabot PRs when tests pass

[uknownothingsnow]

Purpose

This PR adds GitHub Actions workflows to automatically merge Dependabot pull requests when tests are passing, reducing manual maintenance overhead while maintaining code quality.

What's Added

Auto-Merge Workflow (dependabot-auto-merge.yml)

• Triggers only on Dependabot PRs
• Runs full build and test suite
• Auto-merges patch/minor updates when tests pass
• Requires manual review for major version updates

CI Workflow (ci.yml)

• Runs on all PRs and pushes to main/master
• Ensures consistent build and test execution
• Provides quality gate for all changes

Dependabot Config (dependabot.yml)

• Weekly Gradle dependency updates
• Weekly GitHub Actions updates
• Proper labeling and reviewer assignment

How It Works

1. Dependabot creates PR for dependency update
2. CI workflow runs build + tests automatically
3. Auto-merge workflow (Dependabot PRs only):
   • ✅ Merges if tests pass + patch/minor update
   • ⚠️ Comments + requires review for major updates
   • ❌ Takes no action if tests fail

Safety Features

• Only processes dependabot[bot] PRs
• Requires all CI checks to pass
• Conservative approach for major version changes
• Uses GitHub's native auto-merge functionality
• Graceful handling of missing test suites

Benefits

• 🔒 Automated security updates
• ⚡ Reduced manual maintenance
• 🛡️ Only safe changes auto-merge
• 📊 Clear CI status visibility

Compatibility

• Uses JDK 8 for Android project compatibility
• Handles older Gradle versions gracefully
• Includes fallbacks for missing test configurations
• No changes to existing build process

The implementation prioritizes safety - it will only auto-merge when there's high confidence the changes won't break anything.

@uknownothingsnow can click here to continue refining the PR

[openhands-ai]

Looks like there are a few issues preventing this PR from being merged!

• GitHub Actions are failing:
  • CI
  • CI
  • CI
  • CI
  • CI

If you'd like me to help, just leave a comment, like

@OpenHands please fix the failing actions on PR #16

Feel free to include any additional details that might help me get this PR into a better state.

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