ci: add GitHub Actions workflow for testing and building

Author: wiktoriavh

.github/workflows/test.yml

@@ -0,0 +1,39 @@
+name: Test
+
+on:
+  pull_request:
+    branches: [ "**" ]
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: .nvmrc
+          cache: 'pnpm'
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 10
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Lint
+        run: pnpm run lint
+
+      - name: Build
+        run: pnpm run build
+        env:
+          DISCORD_TOKEN: ${{ secrets.DISCORD_TOKEN }}
+          APPLICATION_ID: ${{ secrets.APPLICATION_ID }}
+
+      - name: Run tests
+        run: pnpm run test
+