Add Forgejo runner configuration for automated builds

.forgejo/README.md

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+# Forgejo Runner Setup for TetriStats
+
+This directory contains the workflow configuration for building and releasing the TetriStats Android APK using Forgejo runners.
+
+## Setting up a Forgejo Runner
+
+To set up a Forgejo runner for this repository:
+
+1. Navigate to your Forgejo instance and log in.
+
+2. Go to your repository settings.
+
+3. Navigate to "Actions" or "CI/CD" section.
+
+4. Click on "Runners" and then "Add Runner."
+
+5. Follow the instructions provided by Forgejo to register a new runner.
+
+### Example runner registration commands:
+
+```bash
+# Download the Forgejo runner
+curl -o forgejo-runner -L https://code.forgejo.org/forgejo/runner/releases/download/v3.3.0/forgejo-runner-3.3.0-linux-amd64
+chmod +x forgejo-runner
+
+# Register the runner with your Forgejo instance
+./forgejo-runner register --no-interactive \
+  --instance <your-forgejo-instance-url> \
+  --token <your-registration-token> \
+  --name <runner-name> \
+  --labels ubuntu-latest,linux \
+  --executor docker \
+  --docker-image node:16 \
+  --docker-volumes /var/run/docker.sock:/var/run/docker.sock
+
+# Start the runner
+./forgejo-runner daemon
+```
+
+Replace `<your-forgejo-instance-url>`, `<your-registration-token>`, and `<runner-name>` with your own values.
+
+## Runner Configuration
+
+The workflow is configured to:
+
+1. Build a signed Android APK
+2. Create a release with the APK attached when:
+   - A new tag is pushed (for official releases)
+   - A commit is pushed to main/master (for development releases)
+
+## Troubleshooting
+
+If you encounter issues with the runner:
+
+1. Check the runner logs for errors
+2. Ensure the runner has sufficient permissions to access your repository
+3. Verify that your Forgejo instance supports actions similar to GitHub Actions
+4. Make sure your runner environment has all necessary dependencies installed (Java 17, Android SDK, etc.)
+
+For more information, refer to the [Forgejo Documentation](https://forgejo.org/docs/).