.arcconfig

acl: make sure the extensions is enabled when the acl-hooks run

The acl extension is usually setup through hooks and never directly activated.
This means the config item declared in the extension are not loaded.
We add the necessary logic to make sure the extensions are loaded before the hook
run.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}