Switch to pnpm (#36)

.github/workflows/main.yml

@@ -1,30 +1,32 @@
 name: 'CI'
 on:
-  pull_request:
+  push:
     branches:
-      - '**'
+      - main
+  pull_request:
+
+env:
+  # we call `pnpm playwright install` instead
+  PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD: '1'
+
+# cancel in-progress runs on new commits to same PR (gitub.event.number)
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.number || github.sha }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
 jobs:
-  build:
+  Lint:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-
-      - name: use node v16.x
-        uses: actions/setup-node@v3
+      - uses: pnpm/action-setup@v2.2.4
+      - uses: actions/setup-node@v3
         with:
-          node-version: 16.x
-
-      - name: yarn install
-        uses: borales/actions-yarn@v4
-        with:
-          cmd: install --frozen-lockfile
-
-      - name: prettier lint
-        uses: borales/actions-yarn@v4
-        with:
-          cmd: lint
-
-      - name: svelte check
-        uses: borales/actions-yarn@v4
-        with:
-          cmd: check
+          node-version: '16.x'
+          cache: pnpm
+      - run: pnpm install --frozen-lockfile
+      - run: pnpm run lint
+      - run: pnpm run check