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More specifically, the command being run is this:

```pulumi -C "$target" up -s "$PULUMI_STACK" -c imageTag="$CI_COMMIT_SHA" -c environmentSlug="$CI_ENVIRONMENT_SLUG" --yes```

What does `pulumi plugin ls` tell you in this environment?  Do you have a `pulumi-resource-kubernetes` plugin installed?  Normally you would acquire it by running `npm install` or similar. 

It was returning nothing. I realized the issue was CI caching. When running `yarn install` with a warm cache, install scripts don’t run and that’s how `@pulumi/kubernetes` sets up the plugin. Setting `PULUMI_HOME` and caching that directory together with `node_modules` fixed it for me.