Use GitHub Actions

Author: nanasess

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+on:
+  push:
+    branches:
+      - '*'
+    tags:
+      - '*'
+    paths:
+      - '**'
+      - '!*.md'
+  pull_request:
+    paths:
+      - '**'
+      - '!*.md'
+jobs:
+  tests:
+    name: CI
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ ubuntu-latest ]
+        php: [ '5.3', '5.4', '5.5', '5.6', '7.1', '7.2', '7.3', '7.4', '8.0' ]
+        dependencies: [ 'lowest', 'highest' ]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: none
+
+      - if: matrix.dependencies == 'lowest'
+        run: composer update --no-ansi --no-interaction --no-progress --prefer-lowest
+
+      - if: matrix.dependencies == 'highest'
+        run: composer update --no-ansi --no-interaction --no-progress
+
+      - name: Run tests with phpunit
+        run: php ./phpunit