ci: setup gha

.github/actions/setup/action.yaml

@@ -0,0 +1,21 @@
+name: Setup
+runs:
+  using: composite
+  steps:
+    - uses: actions/checkout@v3
+
+    - uses: actions/setup-node@v3
+      with:
+        node-version: 18
+        registry-url: https://registry.npmjs.org
+        cache: yarn
+
+    - uses: actions/cache@v3
+      id: yarn-cache
+      with:
+        path: node_modules/
+        key: ${{ runner.os }}-install-${{ hashFiles('**/yarn.lock') }}
+
+    - if: steps.yarn-cache.outputs.cache-hit != 'true'
+      run: yarn install --frozen-lockfile --ignore-scripts
+      shell: bash

.github/workflows/lint.yaml

@@ -0,0 +1,25 @@
+name: Lint
+
+on:
+  # manual trigger
+  workflow_dispatch:
+  push:
+    branches:
+      - master
+      - main
+  pull_request:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./.github/actions/setup
+      - run: yarn lint
+
+  format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./.github/actions/setup
+      - run: yarn format:check