ci: setup github actions

.github/workflows/build.yml

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+name: Build checking
+
+on: pull_request
+
+jobs:
+  code:
+    name: Build checking
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: 14.x
+
+      - name: Install dependencies
+        uses: bahmutov/npm-install@v1
+
+      - name: Run TypeScript
+        run: npm run build --if-present

.github/workflows/lint-code.yml

@@ -0,0 +1,24 @@
+name: Lint
+
+on: pull_request
+
+jobs:
+  code:
+    name: Lint code
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: 14.x
+
+      - name: Install dependencies
+        uses: bahmutov/npm-install@v1
+
+      - name: Run ESLint
+        run: npm run lint