regression test for assemble-release layout

.github/workflows/internal-test-plugin.yml

@@ -22,6 +22,19 @@ jobs:
           solution-file-path: plugin-mod.csproj
 
       - uses: ./.github/actions/assemble-release
+        id: assemble-release
         with:
-          artifacts: ${{ env.TESTDIR }}/GameData
+          working-directory: ${{ env.TESTDIR }}
           output-file-name: plugin-mod
+
+      - name: Get github artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: plugin-mod
+          path: github-artifact
+
+      - name: Compare with zip artifact
+        run: |
+          unzip ${{ steps.assemble-release.outputs.artifact-path }} zip-artifact
+          if [[ $(tree github-artifact) != $(tree zip-artifact) ]]; then false; fi # fail if contents differ
+          if [[ ! -d test2/GameData ]]; then false; fi # fail if GameData folder isnt present