Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b, actions/setup-go@0c52d547c9bc32b1aa3301fd7a9cb496313a4491, google-github-actions/auth@55bd3a7c6e2ae7cf1877fd1ccb9d54c0503c457c, google-github-actions/setup-gcloud@98ddc00a17442e89a24bbf282954a3b65ce6d200, hashicorp/setup-packer@ae6b3ed3bec089bbfb576ab7d714df7cbc4b88a4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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The gcloud CLI is not authenticated (or it is not installed). Authenticate by adding the "google-github-actions/auth" step prior this one.