fix: apply install lock on CI forgejo instance

.woodpecker.yml

@@ -44,6 +44,11 @@ steps:
 services:
   forgejo:
     image: codeberg.org/forgejo/forgejo:9
+    environment:
+      FORGEJO__security__INSTALL_LOCK: true
+      FORGEJO__federation__ENABLED: true
+      FORGEJO__server__ROOT_URL: http://forgejo
+      FORGEJO__server__HTTP_PORT: 3000
 
   database:
     image: postgres