add release manifest

Author: phlmn

.github/workflows/build-worker-bundles.yml

@@ -33,10 +33,22 @@ jobs:
         with:
           skip-decompress: true
           merge-multiple: true
+
+      - name: Create manifest.json
+        run: |
+          set -euo pipefail
+          manifest="{}"
+          for f in worker*.tar.xz; do
+            sum=$(sha256sum "$f" | awk '{print $1}')
+            manifest=$(echo "$manifest" | jq ".files.[\"$f\"].sha256 = \"$sum\"")
+          done
+          echo "$manifest" > manifest.json
+
       - uses: softprops/action-gh-release@v3
         with:
           tag_name: dev+${{ github.sha }}
           target_commitish: ${{ github.sha }}
           prerelease: true
           files: |
             worker-*.tar.xz
+            manifest.json