chore: Add CI workflow

.gitea/workflows/ci.yaml

@@ -0,0 +1,31 @@
+name: CI
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  cache-and-install:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+        name: Install pnpm
+        with:
+          version: 8
+          run_install: false
+
+      - name: Install Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: "pnpm"
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Build
+        run: pnpm build