Remove the tag from the attestation, what we attest is the hash, so n…

…o need for it

.github/workflows/release-container-image.yml

@@ -51,11 +51,10 @@ jobs:
           podman tag dangerzone.rocks/dangerzone:$TAG "$FINAL_IMAGE_NAME"
           podman push "$FINAL_IMAGE_NAME" --digestfile=digest
           echo "digest=$(cat digest)" >> "$GITHUB_OUTPUT"
-          echo "tag=$TAG" >> "$GITHUB_OUTPUT"
 
       - name: Generate artifact attestation
         uses: actions/attest-build-provenance@v1
         with:
-          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.build-image.outputs.tag }}
+          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           subject-digest: "${{ steps.build-image.outputs.digest }}"
           push-to-registry: true