Migrate from Travis to GitHub Actions

.github/workflows/tests.yml

@@ -0,0 +1,84 @@
+name: Tests
+
+on:
+    push: ~
+    pull_request: ~
+
+jobs:
+    phpcs:
+        name: PHPCS
+        runs-on: ubuntu-latest
+
+        steps:
+            - uses: actions/checkout@v2
+
+            - uses: shivammathur/setup-php@v2
+              with:
+                  php-version: 7.2
+                  extensions: curl, mbstring
+                  coverage: none
+                  tools: composer:v2, cs2pr
+
+            - run: composer update --no-progress
+
+            - run: vendor/bin/phpcs -q --report=checkstyle | cs2pr
+
+    phpunit:
+        name: PHPUnit on ${{ matrix.php }} ${{ matrix.composer-flags }}
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                php: ['7.2', '7.3', '7.4']
+                coverage: [pcov]
+                composer-flags: ['']
+                include:
+                    - php: '8.0'
+                      coverage: false
+                      composer-flags: '--ignore-platform-req=php'
+
+        steps:
+            - uses: actions/checkout@v2
+
+            - uses: shivammathur/setup-php@v2
+              with:
+                  php-version: ${{ matrix.php }}
+                  extensions: curl
+                  coverage: ${{ matrix.coverage }}
+                  tools: composer:v2
+
+            - run: echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
+
+            - name: "Use PHPUnit 9.3+ on PHP 8"
+              run: composer require --no-update --dev phpunit/phpunit:^9.3
+              if: "matrix.php == '8.0'"
+
+            - run: composer update --no-progress ${{ matrix.composer-flags }}
+
+            - run: vendor/bin/phpunit --no-coverage
+              if: ${{ matrix.coverage == 'none' }}
+
+            - run: vendor/bin/phpunit --coverage-text --coverage-clover=coverage.clover
+              if: ${{ matrix.coverage != 'none' }}
+
+            - run: php vendor/bin/ocular code-coverage:upload --format=php-clover coverage.clover
+              if: ${{ matrix.coverage != 'none' }}
+
+    phpstan:
+        name: PHPStan
+        runs-on: ubuntu-latest
+
+        steps:
+            - uses: actions/checkout@v2
+
+            - uses: shivammathur/setup-php@v2
+              with:
+                  php-version: 7.2
+                  extensions: curl
+                  coverage: none
+                  tools: composer:v2
+
+            - run: composer update --no-progress
+
+            - run: vendor/bin/phpstan analyse --no-progress
+
+            - run: vendor/bin/phpstan analyse --no-progress -c phpstan.tests.neon