Add GITLAB_TOKEN, GITLAB_BASE_URL env vars

Author: weimeng

.github/workflows/acceptance-tests.yml

@@ -20,6 +20,8 @@ jobs:
         echo "::set-env name=MAKE_TARGET::testacc"
         echo "::set-env name=GO_FLAGS::-mod=vendor"
         echo "::set-env name=GO111MODULE::on"
+        echo "::set-env name=GITLAB_TOKEN::20char-testing-token"
+        echo "::set-env name=GITLAB_BASE_URL::http://127.0.0.1:8080/api/v4"
 
     - name: Start Gitlab and run acceptance tests
       run: |