Add CI workflow to run Flutter unit tests on PRs to master

[Copilot]

This PR adds a GitHub Actions workflow to automatically run Flutter unit tests on pull requests targeting the master branch and on pushes to master.

The workflow includes:

• Automated testing: Runs flutter test --coverage on every PR and push to master
• Dependency caching: Caches Flutter SDK and pub dependencies using pubspec.lock hash for faster builds
• Coverage reporting: Uploads coverage/lcov.info as an artifact for each test run
• Concurrency control: Prevents duplicate workflow runs on the same ref to save CI resources
• Ubuntu runner: Uses ubuntu-latest for consistent, fast execution

The workflow will fail if any unit tests fail, ensuring code quality is maintained. Coverage reports will be available as downloadable artifacts from each workflow run.

Once merged, this can be configured as a required status check in branch protection rules to ensure all PRs have passing tests before merge.

Fixes #132.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://storage.googleapis.com/flutter_infra_release/flutter/1e9a811bf8e70466596bcf0ea3a8b5adb5f17f7f/dart-sdk-linux-x64.zip
  • Triggering command: curl --retry 3 --continue-at - --location --output /tmp/flutter/bin/cache/dart-sdk-linux-x64.zip REDACTED (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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[Copilot]

Pull Request Overview

This PR adds a GitHub Actions workflow to automatically run Flutter unit tests and collect coverage reports on pull requests and pushes to the master branch.

• Implements CI automation for Flutter testing with coverage reporting
• Adds dependency caching and concurrency controls for efficient CI resource usage
• Configures artifact upload for coverage reports to enable future analysis

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[java-james]

@copilot This PR will be requiring a rebase on the latest master now.

[Copilot]

@copilot This PR will be requiring a rebase on the latest master now.

Rebase completed successfully. The PR has been updated to include the latest changes from master (commit 79d6bd2). The workflow file remains unchanged and all commits have been properly rebased. Commit d887a44