fix: cosign errors

Signed-off-by: Saurabhkr952 <saurabhkr952@gmail.com>

.github/workflows/multi-stage-workflow.yml

@@ -46,8 +46,13 @@ jobs:
       # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
       - name: Sign image with a key
         run: |
-          cosign sign --yes --key env://COSIGN_PRIVATE_KEY saurabhkr952/dev-portfolio:${{ github.sha }}
+          images=""
+          for tag in ${TAGS}; do
+            images+="${tag}@${DIGEST} "
+          done
+          cosign sign --yes --key env://COSIGN_PRIVATE_KEY ${images}
         env:
+          TAGS: ${{ steps.docker_meta.outputs.tags }}
           COSIGN_PRIVATE_KEY: ${{ secrets.COSIGN_PRIVATE_KEY }}
           COSIGN_PASSWORD: ${{ secrets.COSIGN_PASSWORD }}
           DIGEST: ${{ steps.build-and-push.outputs.digest }}