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Have you set up a kube config file on your gitlab runner that understands how to use `GOOGLE_CREDENTIALS` to connect to your cluster?

I guess more accurately, what have you set up your provider to use in your Pulumi program? By default, it will typically try to use your local `~/.kube/config` file with the current profile. If you're running on CI, you'll need a way to either configure the same config file, or else inject a consistent provider into your program.