add attest action

Author: zachauten

.github/workflows/build.yaml

@@ -27,9 +27,9 @@ jobs:
           sbom: true
           push: true
 
-      # - uses: actions/attest-build-provenance@v1
-      #   with:
-      #     subject-name: ${{ env.IMAGE }}
-      #     subject-digest: ${{ steps.push.outputs.digest }}
-      #     push-to-registry: true
+      - uses: actions/attest-build-provenance@v1
+        with:
+          subject-name: ${{ env.IMAGE }}
+          subject-digest: ${{ steps.push.outputs.digest }}
+          push-to-registry: true