Migrate the CI setup to GitHub Actions

.gitattributes

@@ -3,9 +3,7 @@
 /tests export-ignore
 /.gitattributes export-ignore
 /.gitignore export-ignore
-/.travis.yml export-ignore
-.travis.yml export-ignore
+/.github export-ignore
 .scrutinizer.yml export-ignore
 /phpunit.xml.dist export-ignore
 /README.md export-ignore
-

.github/workflows/ci.yml

@@ -0,0 +1,65 @@
+name: CI
+
+on:
+    push:
+        branches:
+            - master
+            - develop
+    pull_request:
+    workflow_dispatch:
+
+jobs:
+    check_composer:
+        name: Check composer.json
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - uses: shivammathur/setup-php@v2
+              with:
+                  coverage: none
+                  php-version: '8.3'
+            - run: composer validate --strict --no-check-lock
+
+    tests:
+        name: "Tests on PHP ${{ matrix.php }}${{ matrix.name_suffix }}"
+        runs-on: ubuntu-latest
+
+        strategy:
+            fail-fast: false
+            matrix:
+                php: [ '5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3' ]
+                league_version: [ '' ] # Run jobs without changing the requirement from composer.json
+                name_suffix: [ '' ]
+                include:
+                    - php: '5.6'
+                      league_version: '5.1.*'
+                      name_suffix: ' with League 5.1'
+                    - php: '7.4'
+                      league_version: '>=8.0.0 <=8.3.1'
+                      name_suffix: ' with League 8.3.1'
+
+        steps:
+            -   uses: actions/checkout@v4
+            -   uses: shivammathur/setup-php@v2
+                with:
+                    coverage: "none"
+                    php-version: "${{ matrix.php }}"
+                    ini-file: development
+
+            -   name: Update league requirement
+                if: matrix.league_version != ''
+                run: composer require league/oauth2-server:"$LEAGUE_VERSION" --no-update
+
+            -   name: Update permissions
+                run: |
+                    chmod 600 tests/Stubs/private.key
+                    chmod 600 tests/Stubs/public.key
+
+            -   name: Install dependencies
+                run: composer update --ansi --no-progress --prefer-dist --no-interaction
+
+            -   name: Run tests
+                run: php -d error_reporting="E_ALL & ~E_USER_DEPRECATED" vendor/bin/phpunit -v --colors=always --coverage-clover=coverage.clover
+
+            -   name: Upload coverage
+                run: 'wget https://scrutinizer-ci.com/ocular.phar && php ocular.phar code-coverage:upload --format=php-clover coverage.clover'