add ci workflow

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+# This workflow will do a clean installation of node dependencies, cache/restore them, build the source code and run tests across different versions of node
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-nodejs
+
+name: CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - uses: pnpm/action-setup@v2
+      with:
+        version: 8
+    - uses: actions/setup-node@v3
+      with:
+        node-version: 20
+        cache: 'pnpm'
+    - name: Dependencies
+      run: pnpm i
+    - name: Typecheck
+      run: pnpm typecheck
+    - name: Lint
+      run: pnpm lint
+    - name: Test
+      run: pnpm test

Readme.md

@@ -1,5 +1,7 @@
 # TypeScript Extensions
 
+![build](https://github.com/andrej-dyck/ts-extensions/actions/workflows/ci.yml/badge.svg?branch=main)
+
 A collection 📦 of some useful TypeScript extensions.
 
 Intended to be copy&pasted 🍝. No npm package yet.
@@ -14,4 +16,3 @@ Run checks
 ```bash
 pnpm check
 ```
-