fix: attestation subject

Author: PierreJeanjacquot

.github/workflows/sconify.yml

@@ -92,6 +92,7 @@ jobs:
       id-token: write
       attestations: write
     env:
+      IMAGE_REPO: ${{ inputs.docker-registry }}/${{ inputs.image-name }}
       FROM_IMAGE: ${{ inputs.docker-registry }}/${{ inputs.image-name }}:${{ inputs.image-tag }}
       DEBUG_IMAGE: ${{ inputs.docker-registry }}/${{ inputs.image-name }}:${{ inputs.image-tag }}-scone-debug-${{ inputs.sconify-version }}
       PROD_IMAGE: ${{ inputs.docker-registry }}/${{ inputs.image-name }}:${{ inputs.image-tag }}-scone-prod-${{ inputs.sconify-version }}
@@ -157,7 +158,7 @@ jobs:
         if: ${{ inputs.sconify-debug }}
         uses: actions/attest-build-provenance@v2
         with:
-          subject-name: ${{ env.DEBUG_IMAGE }}
+          subject-name: ${{ env.IMAGE_REPO }}
           subject-digest: sha256:${{ steps.push-debug.outputs.checksum }}
           push-to-registry: true
 
@@ -199,6 +200,6 @@ jobs:
         if: ${{ inputs.sconify-prod }}
         uses: actions/attest-build-provenance@v2
         with:
-          subject-name: ${{ env.PROD_IMAGE }}
+          subject-name: ${{ env.IMAGE_REPO }}
           subject-digest: sha256:${{ steps.push-prod.outputs.checksum }}
           push-to-registry: true