core: Add CI step for sealing the version and producing a version-sealed source archive.

.github/workflows/release_nightly.yml

@@ -307,6 +307,25 @@ jobs:
       - name: Install binaryen
         shell: bash -l {0}
         run: conda install -c conda-forge binaryen
+      
+      - name: Produce reproducible source archive
+        if: ${{ !matrix.demo }}
+        shell: bash -l {0}
+        working-directory: web
+        env:
+          ENABLE_VERSION_SEAL: "true"
+        run: node packages/core/tools/set_version.js && zip -r ../reproducible-source.zip .
+
+      - name: Upload reproducible source archive
+        if: ${{ !matrix.demo }}
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ needs.create-nightly-release.outputs.upload_url }}
+          asset_path: ./reproducible-source.zip
+          asset_name: ${{ needs.create-nightly-release.outputs.package_prefix }}-reproducible-source.zip
+          asset_content_type: application/zip
 
       - name: Build web
         env: