ci: add danielroe/provenance-action (#1772)

Author: lachlancollins

.github/workflows/pr.yml

@@ -59,3 +59,15 @@ jobs:
         run: pnpm run build:all
       - name: Publish Previews
         run: pnpx pkg-pr-new publish --pnpm --compact './packages/*' --template './examples/*/*'
+  provenance:
+    name: Provenance
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/[email protected]
+        with:
+          fetch-depth: 0
+      - name: Check Provenance
+        uses: danielroe/[email protected]
+        with:
+          fail-on-downgrade: true