When a webhook-triggered deploy starts for an app that already has a deploy
in progress, the new deploy now cancels the existing one via context
cancellation, waits for the lock to be released, and then starts the new
deploy.
Changes:
- Add per-app context cancellation (appCancels sync.Map) to deploy.Service
- Deploy() creates a cancellable context and registers it for the app
- Add CancelAppDeploy() method to cancel an in-progress deploy
- Add ErrDeployCancelled sentinel error for cancelled deploys
- Handle context cancellation in build and deploy phases, marking
deployments as failed with a clear cancellation message
- Webhook triggerDeployment() now cancels in-progress deploys and retries
until the lock is released (up to 30 attempts with 2s delay)
fixes#38
- Add commit_url column to webhook_events and deployments tables
- Extract commit URL from webhook payload (from commit object or repo URL)
- Format Slack messages with backticks for branch and commit SHA
- Link commit SHA to the actual commit URL on the git server
- Keep plain text format for ntfy notifications