Revert "docker: remove chown the git repos on startup (refs #4996). (#5390)"

This reverts commit 068e6ce2c995445f0ce1c10ee11816600b12a5fd.

docker/s6/gogs/setup

@@ -19,4 +19,5 @@ ln -sfn /data/gogs/data ./data
 # Backward Compatibility with Gogs Container v0.6.15
 ln -sfn /data/git /home/git
 
+chown -R git:git /data /app/gogs ~git/
 chmod 0755 /data /data/gogs ~git/