Now that the git bridge exclusively uses personal access tokens in
ServerPro, it doesn't need to perform a password grant request and
therefore doesn't need to have its OAuth client id and secret
configured.
The default location of the data directory inside the git-bridge
container is /tmp/wlgb, but the data it contains should not be
considered temporary. In order to avoid any misunderstanding that would
lead an administrator to delete the contents of the /tmp directory, we
move the data directory to /data/git-bridge.
This adds a new docker compose configuration for git bridge. This
configuration is loaded only when GIT_BRIDGE_ENABLED is set to true in
config/overleaf.rc
Co-authored-by: Thomas Mees <thomas.mees@overleaf.com>