Add GitHub actions

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+    branches: ['main']
+
+jobs:
+  checks:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v3
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci --ignore-scripts
+
+      - name: Generate Prisma client
+        run: npx prisma generate
+
+      - name: Check TypeScript types
+        run: npm run check-types
+
+      - name: Check ESLint
+        run: npm run lint
+
+      - name: Check Prettier formatting
+        run: npm run check-formatting