ci: init Github actions config file

Author: jogelin

.github/workflows/ci.yml

@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions:
+  actions: read
+  contents: read
+
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 20
+          cache: 'npm'
+      - run: npm ci
+      - uses: nrwl/nx-set-shas@v3
+      # This line is needed for nx affected to work when CI is running on a PR
+      - run: git branch --track main origin/main
+
+      - run: npx nx format:check
+      - run: npx nx affected -t lint,test,build