Add deployment improvements and UI enhancements

- Clone specific commit SHA from webhook instead of just branch HEAD
- Log webhook payload in deployment logs
- Add build/deploy timing to ntfy and Slack notifications
- Implement container rollback on deploy failure
- Remove old container only after successful deployment
- Show relative times in deployment history (hover for full date)
- Update port mappings UI with labeled text inputs
- Add footer with version info, license, and repo link
- Format deploy key comment as upaas_DATE_appname

README.md

@@ -158,6 +158,7 @@ Environment variables:
 |----------|-------------|---------|
 | `PORT` | HTTP listen port | 8080 |
 | `UPAAS_DATA_DIR` | Data directory for SQLite and keys | ./data |
+| `UPAAS_HOST_DATA_DIR` | Host path for DATA_DIR (when running in container) | same as DATA_DIR |
 | `UPAAS_DOCKER_HOST` | Docker socket path | unix:///var/run/docker.sock |
 | `DEBUG` | Enable debug logging | false |
 | `SENTRY_DSN` | Sentry error reporting DSN | "" |
@@ -170,10 +171,14 @@ Environment variables:
 docker run -d \
   -p 8080:8080 \
   -v /var/run/docker.sock:/var/run/docker.sock \
-  -v upaas-data:/var/lib/upaas \
+  -v /path/on/host/upaas-data:/var/lib/upaas \
+  -e UPAAS_HOST_DATA_DIR=/path/on/host/upaas-data \
   upaas
 ```
 
+**Important**: When running µPaaS inside a container, set `UPAAS_HOST_DATA_DIR` to the host path
+that maps to `UPAAS_DATA_DIR`. This is required for Docker bind mounts during builds to work correctly.
+
 Session secrets are automatically generated on first startup and persisted to `$UPAAS_DATA_DIR/session.key`.
 
 ## License