fix entrypoint

Author: marcoacierno

backend/entrypoint.sh

@@ -1,8 +1,6 @@
 #!/bin/sh
 
-source /home/app/.venv/bin/activate
-
 echo "Fixing permissions"
 chown -R app:app /tmp
 
-exec su-exec app "$@"
+su - app -c "$@"