feat(backend): Bunch of changes for Docker

sites/backend/local-config.mjs

@@ -0,0 +1,16 @@
+/*
+ * This method allows you to change/override the backend config
+ *
+ * It takes the initial (base) config object.
+ * It must return the (modified) config object.
+ *
+ * Note that you can configure a lot via environment variables
+ * but if you prefer to keep certain aspects of the config in
+ * code, you can override this file.
+ *
+ * If you're running this in Docker, you can volume-mount only this file.
+ * This gives you full control over the container configuration.
+ */
+export function postConfig(config) {
+  return config
+}