ci: fix should_push always being false (#12252)

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

.github/actions/docker-push-variables/push_vars.py

@@ -9,7 +9,7 @@ parser.read(".bumpversion.cfg")
 
 # Decide if we should push the image or not
 should_push = True
-if len(os.environ.get("DOCKER_USERNAME", "")) > 0:
+if len(os.environ.get("DOCKER_USERNAME", "")) < 1:
     # Don't push if we don't have DOCKER_USERNAME, i.e. no secrets are available
     should_push = False
 if os.environ.get("GITHUB_REPOSITORY").lower() == "goauthentik/authentik-internal":