feat: add bbjs testing workflow

circuits/cpp/barretenberg/.github/workflows/bbjs-testing.yml

@@ -0,0 +1,81 @@
+name: Test bb.js
+
+on:
+  push:
+    branches:
+      - "**"
+
+jobs:
+  build:
+    timeout-minutes: 60
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: "18"
+          registry-url: "https://registry.npmjs.org"
+
+      - name: Install bleeding edge cmake
+        run: |
+          sudo apt -y remove --purge cmake
+          sudo snap install cmake --classic
+
+      - name: Create Build Environment
+        run: |
+          sudo apt-get update
+          sudo apt-get -y install ninja-build yarn
+
+      - name: Install yarn
+        run: |
+          curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
+          echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
+          sudo apt -y update && sudo apt -y install yarn
+
+      - name: Install WASI-SDK
+        run: |
+          cd cpp
+          ./scripts/install-wasi-sdk.sh
+
+      - name: Compile Typescript
+        run: |
+          cd ts
+          yarn install && yarn && yarn build
+
+      - name: Pack the library for npm
+        run: |
+          cd ts
+          npm pack
+          echo "TARBALL_NAME=$(ls *.tgz)" >> $GITHUB_ENV
+
+      - name: Checkout nextjs-bbjs-demo repository
+        uses: actions/checkout@v3
+        with:
+          repository: noir-lang/nextjs-bbjs-demo
+          path: nextjs-bbjs-demo
+
+      - name: Update package.json to point to local tarball dependency
+        run: |
+          jq ".dependencies[\"@aztec/bb.js\"] = \"file:../ts/${TARBALL_NAME}\"" nextjs-bbjs-demo/package.json > nextjs-bbjs-demo/package.temp.json
+          mv nextjs-bbjs-demo/package.temp.json nextjs-bbjs-demo/package.json
+          cat nextjs-bbjs-demo/package.json
+
+      - name: Install dependencies in nextjs-bbjs-demo
+        run: |
+          cd nextjs-bbjs-demo
+          npm install
+
+      - name: Output bb.js package contents
+        run: |
+          cd nextjs-bbjs-demo/node_modules/@aztec/bb.js
+
+      - name: Run dev and test scripts concurrently
+        run: |
+          cd nextjs-bbjs-demo
+          npm run dev
+          sleep 30
+          npm run test