Update build_release.yml

Removing broken attestation for the moment and adding a manual workflow trigger

.github/workflows/build_release.yml

@@ -4,6 +4,7 @@
 name: Release with goreleaser
 
 on:
+  workflow_dispatch:
   push:
     tags:
       - v*
@@ -52,7 +53,3 @@ jobs:
           echo "fs.writeFileSync('digest.txt', firstNonNullDigest);" >> process.js
           node process.js
           echo "digest=$(cat digest.txt)" >> $GITHUB_OUTPUT
-      - name: Attest opaal binary
-        uses: github-early-access/generate-build-provenance@main
-        with:
-          subject-path: opaal