ci: match Pages artifact format

Author: moolen

.github/workflows/docs.yml

@@ -48,14 +48,20 @@ jobs:
 
       - name: Package Pages artifact
         run: |
-          tar --directory ./docs/dist --create --file /tmp/github-pages.tar .
-          gzip --no-name /tmp/github-pages.tar
+          tar \
+            --dereference --hard-dereference \
+            --directory ./docs/dist \
+            -cvf /tmp/artifact.tar \
+            --exclude=.git \
+            --exclude=.github \
+            --exclude='./.[^/]*' \
+            .
 
       - name: Upload artifact
         uses: actions/upload-artifact@v7
         with:
           name: github-pages
-          path: /tmp/github-pages.tar.gz
+          path: /tmp/artifact.tar
           retention-days: 1
           if-no-files-found: error
 

docs/superpowers/specs/2026-04-15-github-actions-warning-cleanup-design.md

@@ -7,7 +7,7 @@ Clean up GitHub Actions warnings without changing the release flow semantics.
 ## Changes
 
 - Replace the release workflow's `github-tag-action` step with an inline shell step that computes the next patch tag, pushes it, and emits the existing outputs.
-- Replace `actions/upload-pages-artifact` with explicit tar/gzip packaging plus a direct `actions/upload-artifact` upload for Pages deployment.
+- Replace `actions/upload-pages-artifact` with explicit tar packaging plus a direct `actions/upload-artifact` upload for Pages deployment, matching the upstream action's artifact format.
 - Replace `azure/setup-helm` with explicit Helm binary installation in CI jobs.
 - Bump first-party GitHub actions to current major versions that support the Node 24 transition.
 - Bump the Docker-maintained GitHub actions in the release workflow to their current major versions.