feat: support release attestations

Author: samypr100

.github/workflows/release.yml

@@ -78,3 +78,12 @@ jobs:
       # Uploading the relevant artifact to the GitHub release.
       - run: just release-run ${{ secrets.GITHUB_TOKEN }} ${{ github.event.inputs.sha }} ${{ github.event.inputs.tag }}
         if: ${{ github.event.inputs.dry-run == 'false' }}
+
+      # We filter by *.tar.@(zst|gz) since actions/attest-build-provenance only supports up to 1024 subjects
+      - name: Generate attestations
+        uses: actions/attest-build-provenance@v2
+        if: ${{ github.event.inputs.dry-run == 'false' }}
+        with:
+          subject-path: |
+            dist/*.tar.gz
+            dist/*.tar.zst