chore: .configをdockerイメージに入れないように (#7625)

* .configをdockerイメージに入れないように

* Update docker-compose.yml

Co-authored-by: tamaina <tamaina@hotmail.co.jp>

Co-authored-by: MeiMei <30769358+mei23@users.noreply.github.com>
Co-authored-by: tamaina <tamaina@hotmail.co.jp>

.dockerignore

@@ -2,6 +2,7 @@
 .github
 .travis
 .vscode
+.config
 Dockerfile
 build/
 built/

docker-compose.yml

@@ -15,6 +15,7 @@ services:
       - external_network
     volumes:
       - ./files:/misskey/files
+      - ./.config:/misskey/.config:ro
 
   redis:
     restart: always