We're now using gosu to switch our user down :)

Dockerfile

@@ -47,6 +47,7 @@ RUN apt-get update && apt-get -y install \
   npm \
   python2 \
   python3 \
+  gosu &\
   atomicparsley && \
   apt-get install -f && \
   apt-get autoremove --purge && \

backend/entrypoint.sh

@@ -3,10 +3,15 @@ set -eu
 
 CMD="pm2-runtime pm2.config.js"
 
+# if the first arg starts with "-" pass it to program
+if [ "${1#-}" != "$1" ]; then
+  set -- "$CMD" "$@"
+fi
+
 # chown current working directory to current user
 if [ "$*" = "$CMD" ] && [ "$(id -u)" = "0" ]; then
   find . \! -user "$UID" -exec chown "$UID:$GID" -R '{}' + || echo "WARNING! Could not change directory ownership. If you manage permissions externally this is fine, otherwise you may experience issues when downloading or deleting videos."
-  su -c "$0" "$(id -un $UID)" "$@"
+  exec gosu "$UID:$GID" "$0" "$@"
 fi
 
 exec "$@"