add env_vars nobuild

flexget/config.yaml

@@ -76,6 +76,7 @@ map:
   - media
 name: Flexget
 options:
+  env_vars: []
   PGID: 0
   PUID: 0
   WebuiPass: homeassistant123
@@ -84,6 +85,9 @@ ports:
 ports_description:
   5050/tcp: Web interface
 schema:
+  env_vars:
+    - name: match(^[A-Z0-9_]+$)
+      value: str?
   FG_LOG_LEVEL: list(critical|error|warning|info|verbose|debug|trace)?
   FG_PLUGINS: str?
   PGID: int