Add a GitHub Workflow to validate JS bindings

.github/actions/install-emsdk/action.yml

@@ -0,0 +1,22 @@
+name: Install emsdk (including emcc)
+inputs:
+  version:
+    description: EMCC Version to install
+    required: false
+    default: 3.1.28
+
+runs:
+  using: "composite"
+  steps:
+    - name: Clone emsdk repo
+      working-directory: ${{ runner.temp }}
+      shell: bash
+      run: git clone https://github.com/emscripten-core/emsdk.git
+
+    - name: emdsk install
+      working-directory: ${{ runner.temp }}/emsdk
+      shell: bash
+      run: |
+        ./emsdk install ${{ inputs.version }}
+        ./emsdk activate ${{ inputs.version }}
+        source $RUNNER_TEMP/emsdk/emsdk_env.sh

.github/actions/setup-js/action.yml

@@ -0,0 +1,17 @@
+name: Setup JavaScript envirionment
+
+runs:
+  using: "composite"
+  steps:
+    - name: Install Node
+      uses: actions/setup-node@v1
+      with:
+        node-version: 18.x
+
+    - name: Install emsdk
+      uses: ./.github/actions/install-emsdk
+
+    - name: yarn install
+      shell: bash
+      run: yarn install --frozen-lockfile
+      working-directory: javascript

.github/actions/setup-website/action.yml

@@ -3,11 +3,15 @@ name: Setup Website envirionment
 runs:
   using: "composite"
   steps:
-    - name: Install NodeJS 12
+    # TODO: Update to latest when website is moved to the workspace version of
+    # yoga-layout
+    - name: Install Node
       uses: actions/setup-node@v1
       with:
         node-version: 12.x
 
+    # TODO: the website should be in a yarn workspace with the library, but the
+    # current version of gatsby is incompatible with hoisting.
     - name: yarn install
       shell: bash
       run: yarn install --frozen-lockfile

.github/workflows/validate-js.yml

@@ -0,0 +1,27 @@
+name: JavaScript
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build + Test
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Setup
+        uses: ./.github/actions/setup-js
+
+      - name: yarn build
+        run: yarn build
+        working-directory: javascript
+
+      - name: yarn test
+        run: yarn test
+        working-directory: javascript