feat(ci): add CI configuration for pull requests and pushes to main

Author: hendrikebbers

.github/workflows/ci.yml

@@ -0,0 +1,50 @@
+name: CI
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: read
+
+# Cancel superseded runs for the same PR/branch to save CI minutes.
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      # pnpm version comes from the "packageManager" field in package.json,
+      # Node version from .nvmrc — same single sources of truth as the release.
+      - uses: pnpm/action-setup@v4
+
+      - uses: actions/setup-node@v6
+        with:
+          node-version-file: ".nvmrc"
+          cache: "pnpm"
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Type-check
+        run: pnpm run typecheck
+
+      - name: Lint
+        run: pnpm run lint
+
+      - name: Check formatting
+        run: pnpm run format:check
+
+      - name: Test
+        run: pnpm run test
+
+      - name: Build
+        run: pnpm run build