CI: configure Github Actions

Signed-off-by: Jesse Chan <jc@linux.com>

.github/workflows/build.yml

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+name: Build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node: [12, 14]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Use Node.js ${{ matrix.node }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node }}
+
+    - run: cp config.template.js config.js
+    - run: npm install
+    - run: npm run build

.github/workflows/check-source-formatting.yml

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+name: Check source formatting
+
+on: [push, pull_request]
+
+jobs:
+  check-source-formatting:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node: [12, 14]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Use Node.js ${{ matrix.node }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node }}
+
+    - run: cp config.template.js config.js
+    - run: npm install
+    - run: npm run check-source-formatting

.github/workflows/check-types.yml

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+name: Check types
+
+on: [push, pull_request]
+
+jobs:
+  check-types:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node: [12, 14]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Use Node.js ${{ matrix.node }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node }}
+
+    - run: cp config.template.js config.js
+    - run: npm install
+    - run: npm run check-types

.github/workflows/lint.yml

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+name: Lint
+
+on: [push, pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node: [12, 14]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Use Node.js ${{ matrix.node }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node }}
+
+    - run: cp config.template.js config.js
+    - run: npm install
+    - run: npm run lint