Improve GHA CI

Author: akx

.github/workflows/build.yml

@@ -4,9 +4,15 @@ on:
   push:
     branches:
       - master
+  release:
+    types: [published]
 jobs:
   build-wheel:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      id-token: write
+      attestations: write
     steps:
       - uses: actions/checkout@v6
       - uses: astral-sh/setup-uv@61cb8a9741eeb8a550a1b8544337180c0fc8476b # v7.2.0
@@ -20,3 +26,13 @@ jobs:
         with:
           name: dist
           path: dist/
+      - name: Attest build provenance
+        if: github.event_name == 'release'
+        uses: actions/attest-build-provenance@v2
+        with:
+          subject-path: dist/*.whl
+      - name: Upload wheel to release
+        if: github.event_name == 'release'
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: gh release upload "${{ github.event.release.tag_name }}" dist/*.whl