Add missing workers for jobs, post install message for setup, and pull in emujs/ruffle from docker release

supervisor/watcher.conf

@@ -0,0 +1,12 @@
+[program:watcher]
+priority=20
+directory=/app/code/backend
+environment=HOME=/app/code
+command=uv run watchfiles --target-type command 'uv run python watcher.py' /app/data/library
+user=cloudron
+autostart=true
+autorestart=true
+stdout_logfile=/dev/stdout
+stdout_logfile_maxbytes=0
+stderr_logfile=/dev/stderr
+stderr_logfile_maxbytes=0