fix(ci): update cosign sign command to include registry credentials

Author: TheMeinerLP

.github/workflows/sematic-releases.yml

@@ -115,7 +115,7 @@ jobs:
           for tag in ${TAGS}; do
             images+="${tag}@${DIGEST} "
           done
-          cosign sign --yes --key env://COSIGN_PRIVATE_KEY ${images}
+          cosign sign --yes --registry-username='${{ secrets.HARBOR_USERNAME }}' --registry-password='${{ secrets.HARBOR_PASSWORD }}' --key env://COSIGN_PRIVATE_KEY ${images}
         env:
           TAGS: ${{ steps.meta.outputs.tags }}
           COSIGN_PRIVATE_KEY: ${{ secrets.COSIGN_KEY }}