add workflow

Author: pngwn

.github/workflows/test.yml

@@ -0,0 +1,29 @@
+name: test
+
+on:
+  push: main
+  pull_request: main
+
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      - uses: actions/cache@v2
+        id: pnpm-store
+        with:
+          path: ~/.pnpm-store/v3
+          key: ${{ runner.os }}-pnpm-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-
+      - uses: pnpm/action-setup@v1.2.1
+        with:
+          version: 5
+      - run: pnpm i --frozen-lockfile
+      - run: pnpm ts
+      - run: pnpm test
+      - run: pnpm build