chore: Add semantic-release

.github/workflows/default.yml

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+name: Default
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        php: [ 7.1, 7.2, 7.3, 7.4, 8.0 ]
+        stability: [ prefer-lowest, prefer-stable ]
+
+    name: PHP ${{ matrix.php }} - ${{ matrix.stability }}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, gd, redis, memcached
+          tools: composer:v2
+          coverage: none
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate
+
+      - name: Cache Composer packages
+        id: composer-cache
+        uses: actions/cache@v2
+        with:
+          path: vendor
+          key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-php-
+
+      - name: Install dependencies
+        if: steps.composer-cache.outputs.cache-hit != 'true'
+        run: composer install --prefer-dist --no-progress --no-suggest
+
+      - name: Run phpstan analyse
+        run: ./vendor/bin/phpstan analyse
+
+      - name: Run test suite
+        run: ./vendor/bin/phpunit
+
+  semantic-release:
+    runs-on: ubuntu-latest
+    needs: [ test ]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: '12'
+
+      - name: Run semantic-release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
+        run: npx semantic-release

.releaserc.yml

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+plugins:
+  - "@semantic-release/commit-analyzer"
+  - "@semantic-release/release-notes-generator"
+  - "@semantic-release/github"