Clean up commented out gcloud install step.

[SortaCookie]

This was accidentally left in from #9225.

Bug: 432823450

[github-actions]

🤖 Gemini Suggested Commit Message

---

ci: Simplify SCCACHE GCS key condition

The SCCACHE GitHub Action configuration is updated to allow for
read-only sccache operation when no GCS key is provided. This
removes the need for a gcloud installation step when only
reading from the cache is required.

The main workflow's enable_sccache condition is simplified as
SCCACHE can now function without a GCS key. This change cleans
up lingering requirements from previous workflow adjustments.

Bug: 432823450

---

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[gemini-code-assist]

Code Review

This pull request updates the sccache GitHub Action to conditionally configure cache access. It now supports read-write access when a GCS key is provided, and falls back to read-only access otherwise. The logic is sound, but I've suggested a small refactoring to improve maintainability by removing a duplicated bucket name.

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.github/actions/sccache/action.yaml (18-30)

To improve maintainability and avoid duplicating the bucket name string, consider defining it in a variable at the beginning of the script and reusing it in both the if and else blocks. This will make future updates to the bucket name easier and less error-prone.

      BUCKET_NAME="cobalt-sccache-tvos-bucket"
      if [[ -n "$SCCACHE_GCS_KEY" ]]; then
        # If we have a GCS key we use READ_WRITE
        printf "%s" "$SCCACHE_GCS_KEY" > "${HOME}/gcloud.json"
        echo "SCCACHE_GCS_KEY_PATH=${HOME}/gcloud.json" >> $GITHUB_ENV
        echo "SCCACHE_GCS_RW_MODE=READ_WRITE" >> $GITHUB_ENV
        echo "SCCACHE_GCS_BUCKET=${BUCKET_NAME}" >> $GITHUB_ENV
      else
        # Read only
        echo "SCCACHE_BUCKET=${BUCKET_NAME}" >> $GITHUB_ENV
        echo "SCCACHE_ENDPOINT=https://storage.googleapis.com" >> $GITHUB_ENV
        echo "SCCACHE_S3_NO_CREDENTIALS=true" >> $GITHUB_ENV
        echo "SCCACHE_REGION=auto" >> $GITHUB_ENV
      fi