ci: skip package upload and simplify test workflow for external PRs

Author: ahnv

.github/workflows/ci.yaml

@@ -38,6 +38,7 @@ jobs:
 
   test:
     runs-on: ubuntu-latest
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
 
     steps:
       - name: ⬇️  Check out code
@@ -52,19 +53,12 @@ jobs:
           node-version: 20.x
           cache: yarn
 
-      - name: 📦  Install deps, build, pack
+      - name: 📦  Install deps, build
         run: |
           yarn install --frozen-lockfile
           yarn build
-          yarn pack --out %s-%v.tgz
         env:
           CI: true
 
-      - name: 📤  Upload package artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: strapi-plugin-imagekit-package
-          path: strapi-plugin-imagekit-*.tgz
-
       - name: 🧪 Run tests
         run: yarn test:unit:ci