fix(docker): allow node user to write to n8n/dist/public (#4245)

docker/images/n8n/docker-entrypoint.sh

@@ -6,7 +6,9 @@ if [ -d /root/.n8n ] ; then
   ln -s /root/.n8n /home/node/
 fi
 
-chown -R node /home/node
+# node user needs to be able to write in this folder to be able to customize static assets
+mkdir -p /usr/local/lib/node_modules/n8n/dist/public
+chown -R node /home/node /usr/local/lib/node_modules/n8n/dist/public
 
 if [ "$#" -gt 0 ]; then
   # Got started with arguments