Fix CI artifact so the downloaded plugin installs directly

Gitea/Actions re-zips artifacts on download, so uploading the built plugin
zip produced a double-wrapped archive (a zip containing a zip). WordPress
then reported "No valid plugins were found" because the upload had no
plugin folder/header at its top level.

Unpack the built zip and upload the resulting plugin folder instead, so the
downloaded artifact's top level is unsupervised-schedular/ and installs
directly via Plugins -> Add New -> Upload.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -127,9 +127,16 @@ jobs:
           version="$(sed -nE 's/^[[:space:]]*\*?[[:space:]]*Version:[[:space:]]*([^[:space:]]+).*/\1/p' unsupervised-schedular.php | head -1)"
           echo "version=${version}" >> "$GITHUB_OUTPUT"
 
+      # Gitea/Actions re-zips artifacts on download. Upload the unpacked plugin
+      # folder (not the built zip) so the downloaded archive's top level is
+      # unsupervised-schedular/ and installs directly in WordPress. Uploading
+      # the zip instead double-wraps it ("No valid plugins were found").
+      - name: Unpack plugin for artifact
+        run: unzip -q "dist/unsupervised-schedular-${{ steps.meta.outputs.version }}.zip" -d artifact
+
       - name: Upload artifact
         uses: actions/upload-artifact@v3
         with:
           name: unsupervised-schedular-${{ steps.meta.outputs.version }}
-          path: dist/*.zip
+          path: artifact/
           if-no-files-found: error