Add build (#454)

Author: tamiroh

.github/workflows/test.yml

@@ -36,3 +36,14 @@ jobs:
               run: pnpm install
             - name: Run tsc
               run: tsc --noEmit
+    build:
+        runs-on: ubuntu-latest
+        steps:
+            -   uses: actions/checkout@v2
+            -   uses: pnpm/action-setup@v2
+                with:
+                    version: 6.0.2
+            -   name: Install modules
+                run: pnpm install
+            -   name: Run build
+                run: pnpm run build