chore: update signing key to version 2

Author: ReinerSchinkoethe

.github/workflows/application-example-release-workflow.yml

@@ -59,7 +59,7 @@ jobs:
       - name: Pack the template
         uses: simatic-ax/actions/apax-pack@v3
         with:
-          key: ${{ secrets.APAX_SIGNKEY }}
+          key: ${{ secrets.APAX_SIGNKEY_V2 }}
           path: ${{ env.TEMPLATE_PATH }}
 
       - name: Login to required registries
@@ -75,4 +75,4 @@ jobs:
           registries: |
             https://npm.pkg.github.com
           tag: latest
-          path: ${{ env.TEMPLATE_PATH }}
+          path: ${{ env.TEMPLATE_PATH }}