feat(ci): add CI workflow for unit tests and typechecks

.github/workflows/ci.yml

@@ -0,0 +1,41 @@
+name: CI
+
+on:
+    push:
+        branches:
+            - master
+    pull_request:
+        branches:
+            - master
+    workflow_dispatch:
+
+jobs:
+    unit-and-typecheck:
+        name: Unit Tests and Typechecks
+        runs-on: ubuntu-latest
+        timeout-minutes: 30
+
+        steps:
+            - name: Checkout code
+              uses: actions/checkout@v4
+
+            - name: Install pnpm
+              uses: pnpm/action-setup@v4
+
+            - name: Setup Node.js
+              uses: actions/setup-node@v4
+              with:
+                  node-version: '22'
+                  cache: 'pnpm'
+
+            - name: Install dependencies
+              run: pnpm install --frozen-lockfile
+
+            - name: Typecheck web and Electron entry points
+              run: pnpm run typecheck:ci
+
+            - name: Run curated Nx unit test suite
+              run: pnpm run test:unit:ci
+              env:
+                  CI: true
+                  NX_TASKS_RUNNER_DYNAMIC_OUTPUT: false