ci: check TypeScript formatting in a dedicated job

Author: eitsupi

.github/workflows/main.yml

@@ -128,6 +128,18 @@ jobs:
         with:
           name: ${{ env.VSIX_FILE }}
           path: ${{ env.VSIX_FILE }}
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: pnpm/action-setup@ea17c68df8912ef543352723c149a84f56e3d413 # v6.1.0
+      - uses: actions/setup-node@949feb2413d6458794dcd2491c4babbbce0c15c1 # v7.1.0
+        with:
+          node-version: 24
+          cache: 'pnpm'
+      - run: pnpm install --frozen-lockfile
+      - name: Check TypeScript formatting
+        run: pnpm run format:check
   lint:
     runs-on: ubuntu-latest
     env: