Merge pull request #65 from SAP/o-liver-patch-1

Upgrade checkout action

Author: o-liver

.github/workflows/push.yml

@@ -15,7 +15,7 @@ jobs:
       packages: write
       contents: read
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Run CI
       run: |
         echo ${{ secrets.DOCKERHUB_PASSWORD }} | docker login -u ${{ secrets.DOCKERHUB_USER }} --password-stdin