[ci] golf, change working directory for package-validation

Author: Percslol

.github/workflows/main.yml

@@ -155,13 +155,15 @@ jobs:
         uses: actions/download-artifact@v4
         with:
           name: packaged-scramjet
-          path: .
+          path: packages/scramjet/packages/core
 
       - name: Extract package
         run: tar xvf mercuryworkshop-scramjet-*.tgz package --strip-components=1
+        working-directory: packages/scramjet/packages/core
 
       - name: Run package validation tests
         run: pnpm test:package
+        working-directory: packages/scramjet/packages/core
 
   tests:
     name: Run Scramjet Tests