Initial Cloudron package for Jellyseerr

- Add CloudronManifest.json with app configuration
- Add Dockerfile with Node.js 22 support and multi-stage build
- Add start.sh script for runtime initialization
- Add icon.png for the app
- Update README.md with installation and usage instructions
- Configure config directory symlink to /app/data for persistent storage

start.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+set -eu
+
+echo "Starting Jellyseerr..."
+
+# Set environment variables for Cloudron
+# Cloudron provides PORT, but Jellyseerr may use PORT_NUMBER
+export PORT=${PORT:-5055}
+export PORT_NUMBER=${PORT:-5055}
+export NODE_ENV=production
+
+# Ensure config directory and required subdirectories exist
+mkdir -p /app/data/config/logs
+mkdir -p /app/data/config/db
+
+# Start Jellyseerr
+cd /app/code/jellyseerr
+exec pnpm start
+