ci: build wasm and javascript index as artifacts of release

As a preliminary step to uploading to NPM, we'd like to package the wasm
and test its build process and utility in github releases alone. At this
point, the SDK should be usable from chainlink, just with slightly less
convenience.

.github/workflows/release.yml

@@ -40,10 +40,28 @@ jobs:
           github_token: ${{ secrets.GH_TOKEN }}
           branch: ${{ github.ref }}
 
+      - name: Install stable toolchain
+        run: curl https://sh.rustup.rs -sSf | bash -s -- -y --profile minimal && source ~/.cargo/env
+
+      - name: Install build dependencies
+        run: export DEBIAN_FRONTEND=non-interactive && sudo apt-get update && sudo apt-get install -y clang lld protobuf-compiler
+
+      - name: Install wasm-pack
+        run: cargo install wasm-pack
+
+      - name: Build wasm binary
+        run: wasm-pack build --release --target deno --no-typescript crates/proof-of-sql-sdk-wasm
+
+      - name: Build javascript index
+        run: |
+          chmod +x ./node/src/build_index.sh
+          ./node/src/build_index.sh crates/proof-of-sql-sdk-wasm/pkg
+
       - name: Create Release
         uses: ncipollo/release-action@v1
         with:
           tag: ${{ steps.conventional-changelog.outputs.tag }}
           body: ${{ steps.conventional-changelog.outputs.changelog }}
           token: ${{ secrets.GH_TOKEN }}
+          artifacts: "node/src/index.js,node/src/sxt_proof_of_sql_sdk_wasm_bg.wasm"
           makeLatest: true