add env_vars nobuild

filebrowser/config.yaml

@@ -92,6 +92,7 @@ map:
   - ssl:rw
 name: Filebrowser
 options:
+  env_vars: []
   NoAuth: true
   certfile: fullchain.pem
   disable_thumbnails: true
@@ -107,6 +108,9 @@ privileged:
   - SYS_ADMIN
   - DAC_READ_SEARCH
 schema:
+  env_vars:
+    - name: match(^[A-Z0-9_]+$)
+      value: str?
   NoAuth: bool
   base_folder: str?
   certfile: str