chore: make Docker image rootless (#683)

* add first version of rootless docker image

* skip user creation if user is already a non root user

scripts/docker/entrypoint.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+# Copy default logo to the frontend public folder if it doesn't exist
+cp -rn /tmp/img/* /opt/app/frontend/public/img
+
+# Start Caddy
+if [ "$TRUST_PROXY" = "true" ]; then
+  caddy start --config /etc/caddy/Caddyfile.trust-proxy &
+else
+  caddy start --config /etc/caddy/Caddyfile &
+fi
+
+# Run the frontend server
+PORT=3333 HOSTNAME=0.0.0.0 node frontend/server.js &
+
+# Run the backend server
+cd backend && npm run prod
+
+# Wait for all processes to finish
+wait -n