chore: add new env

examples/vouchervault/docker-compose.yml

@@ -12,6 +12,8 @@ services:
       - EXPIRY_THRESHOLD_DAYS=90
       # define the timezone
       - TZ=Europe/Berlin
+      # define custom x-frame-options response header
+      #- X-FRAME-OPTIONS=other.example.tld      
       # ------- OPTIONAL OIDC AUTH --------
       # Set to 'True' to enable OIDC authentication
       #- OIDC_ENABLED=True