try a build with node user

entrypoint.sh

@@ -5,11 +5,10 @@ echo "Changing permissions of /var/run/docker.sock for sibling containers"
 chown root:docker /var/run/docker.sock
 
 mkdir -p /app/cache
-chown -R app:app /app/cache
+chown -R node:node /app/cache
 
 mkdir -p /app/compiles
-chown -R app:app /app/compiles
-chmod -R 777 /app/compiles #TODO why do I need this?
+chown -R node:node /app/compiles
 
 ./bin/install_texlive_gce.sh
-exec runuser -u app "$@"
+exec runuser -u node "$@"