feat: error out on Procfile extraction if the procfile is invalid

Refs #2991
Refs #3196

plugins/ps/functions

@@ -23,6 +23,9 @@ extract_procfile() {
   copy_from_image "$IMAGE" "Procfile" "$DOKKU_PROCFILE" 2>/dev/null || true
   if [[ -f "$DOKKU_PROCFILE" ]]; then
     dokku_log_info1_quiet "App Procfile file found ($DOKKU_PROCFILE)"
+    # shellcheck disable=SC2069
+    PROCFILE_ERRORS="$(procfile-util check "$DOKKU_PROCFILE" 2>&1 >/dev/null || true)"
+    [[ -n "$PROCFILE_ERRORS" ]] && dokku_log_fail "${PROCFILE_ERRORS}"
   else
     dokku_log_info1_quiet "No Procfile found in app image"
   fi