feat: make ci more robust

Signed-off-by: Alix von Schirp <github@avonschirp.bootmedia.de>

.github/workflows/ci.yaml

@@ -2,11 +2,21 @@ on: [push, pull_request]
 
 jobs:
   check:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        node-version: [20, 22]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Install Deps
-        run: npm install -g pnpm && pnpm install
+        uses: pnpm/action-setup@v4
+      - name: Setup Node
+        uses: actions/setup-node@v5
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: "pnpm"
+      - name: Install
+        run: pnpm install
       - name: Typecheck & Lint
-        run: pnpm check
+        run: SKIP_ENV_VALIDATION=true turbo check