chore: set up GitHub Actions

Author: soedirgo

.github/workflows/ci.yml

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+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  test:
+    name: Test / OS ${{ matrix.os }} / Node ${{ matrix.node }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        node: ['12']
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node }}
+
+      - name: Run tests
+        run: |
+          npm ci
+          npm t

.github/workflows/docs.yml

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+name: Docs
+
+on:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  docs:
+    name: Publish docs / OS ${{ matrix.os }} / Node ${{ matrix.node }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        node: ['12']
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node }}
+
+      - run: |
+          npm ci
+          npm run docs
+
+      - name: Publish
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: docs
+          force_orphan: true
+          commit_message: 'docs: update'

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  release:
+    name: Release / Node ${{ matrix.node }}
+    strategy:
+      matrix:
+        node: ['12']
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node }}
+
+      - run: npm ci
+
+      - name: Create a release
+        run: npx semantic-release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}