NO-JIRA fix(gha): prevent misleading compsize error in CI (#1257)

Adds a condition to the compsize execution step in the GitHub Actions workflow to ensure it only runs if the `btrfs-compsize` package was installed successfully.

This prevents the workflow from failing with a `compsize: command not found` error when the actual issue is the failed installation of `btrfs-compsize`.

Also, reordered `id` and `run` in the installation step for stylistic consistency.

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Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: jiridanek

.github/workflows/build-notebooks-TEMPLATE.yaml

@@ -146,7 +146,8 @@ jobs:
 
           df -h
 
-      - run: sudo apt-get install -y btrfs-compsize
+      - id: install-compsize
+        run: sudo apt-get install -y btrfs-compsize
 
       - name: Mount lvm overlay for podman builds
         run: |
@@ -705,4 +706,4 @@ jobs:
         if: "${{ !cancelled() }}"
 
       - run: sudo compsize -x "${HOME}/.local/share/containers"
-        if: "${{ !cancelled() }}"
+        if: "${{ !cancelled() && steps.install-compsize.outcome == 'success' }}"