Avoid permission problems related to cgroups in docker-compose.yml

Author: yrodiere

Diff for: docker-compose.yml

@@ -7,6 +7,6 @@ services:
     # https://github.com/BretFisher/jekyll-serve/blob/2119a31476e1c6004a4bea4739b9160fc73e7bda/Dockerfile#L27C5-L27C94
     command: [ "bundle", "exec", "jekyll", "serve", "--force_polling", "-H", "0.0.0.0", "-P", "4000", "--incremental" ]
     volumes:
-      - .:/site
+      - .:/site:Z
     ports:
       - '4000:4000'