remove chown from CMD to allow image to run as an unprivileged user

.docker/Dockerfile

@@ -31,4 +31,4 @@ USER node
 ENV NODE_ENV=production
 ENV PASSWORD=flame_password
 
-CMD ["sh", "-c", "chown -R node /app/data && node server.js"]
+CMD ["node", "server.js"]

.docker/Dockerfile.multiarch

@@ -32,4 +32,4 @@ USER node
 ENV NODE_ENV=production
 ENV PASSWORD=flame_password
 
-CMD ["sh", "-c", "chown -R node /app/data && node server.js"]
+CMD ["node", "server.js"]