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