feat: allow skipping pulling an image for the redis plugin when REDIS_DISABLE_PULL=true

functions

@@ -30,6 +30,12 @@ service_create() {
   service_parse_args "${@:2}"
 
   if ! docker images | grep -e "^$PLUGIN_IMAGE " | grep -q " $PLUGIN_IMAGE_VERSION " ; then
+    if [[ "$REDIS_DISABLE_PULL" == "true" ]]; then
+      dokku_log_warn "REDIS_DISABLE_PULL environment variable detected. Not running pull command." 1>&2
+      dokku_log_warn "   docker pull ${IMAGE}" 1>&2
+      dokku_log_warn "$PLUGIN_SERVICE service creation failed"
+      exit 1
+    fi
     docker pull "$PLUGIN_IMAGE:$PLUGIN_IMAGE_VERSION" || dokku_log_fail "$PLUGIN_SERVICE image $PLUGIN_IMAGE:$PLUGIN_IMAGE_VERSION pull failed"
   fi