tests/docker: don't use BUILDKIT in GitLab either

Using BUILDKIT breaks with certain container registries such as CentOS,
with docker build reporting an error such as

  failed to solve with frontend dockerfile.v0:
  failed to build LLB: failed to load cache key:
  unexpected status code
  https://registry.centos.org/v2/centos/manifests/7:
  403 Forbidden

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Message-Id: <20210623142245.307776-3-berrange@redhat.com>
Message-Id: <20210709143005.1554-11-alex.bennee@linaro.org>

diff --git a/tests/docker/docker.py b/tests/docker/docker.py
index 4d9bb7c7ed24902290f8b1797fc05bf0d4e260d6..78dd13171e2dfe49359681e9b238533d6b96074f 100755 (executable)
--- a/tests/docker/docker.py
+++ b/tests/docker/docker.py
@@ -228,7 +228,9 @@ class Docker(object):
     def __init__(self):
         self._command = _guess_engine_command()
 
-        if "docker" in self._command and "TRAVIS" not in os.environ:
+        if ("docker" in self._command and
+            "TRAVIS" not in os.environ and
+            "GITLAB_CI" not in os.environ):
             os.environ["DOCKER_BUILDKIT"] = "1"
             self._buildkit = True
         else: