feat(helm): add DEFAULT_ACTIONS_URL to enable GitHub actions

apps/infra/devops/gitea/helmchart.yaml

@@ -82,6 +82,7 @@ spec:
           DEFAULT_REPO_UNITS: repo.code,repo.releases,repo.issues,repo.pulls
         actions:
           ENABLED: true
+          DEFAULT_ACTIONS_URL: github
         service:
           DISABLE_REGISTRATION: true
           NO_REPLY_ADDRESS: noreply.dev.cm