Enable a CI workflow to catch errors in the build and coding

.github/workflows/ci.yml

@@ -0,0 +1,43 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: ["main"]
+  release:
+    types:
+      - published
+  workflow_dispatch:
+
+# cancel older runs of a pull request;
+# this will not cancel anything for normal git pushes
+concurrency:
+  group: cancel-old-pr-runs-${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: ".nvmrc"
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Run tests
+        run: npm test
+
+      - name: Build
+        run: npm run build
+
+      # - name: Archive production artifact
+      #   uses: actions/upload-artifact@v4
+      #   with:
+      #     name: morphir-cli