Update ci.yml

Author: rennokki

.github/workflows/ci.yml

@@ -13,24 +13,42 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+
     strategy:
       matrix:
         php: ['7.2', '7.3', '7.4']
-    name: PHP ${{ matrix.php }}
+        laravel: ['6.*', '7.*', '8.*']
+        prefer: ['prefer-lowest', 'prefer-stable']
+        include:
+          - laravel: '6.*'
+            testbench: '4.*'
+          - laravel: '7.*'
+            testbench: '5.*'
+          - laravel: '8.*'
+            testbench: '6.*'
+
+    name: PHP ${{ matrix.php }} - Laravel ${{ matrix.laravel }} --${{ matrix.prefer }}
+
     steps:
     - uses: actions/checkout@v1
+
     - uses: actions/cache@v1
+
       name: Cache dependencies
       with:
         path: ~/.composer/cache/files
-        key: composer-php-${{ matrix.php }}-${{ hashFiles('composer.json') }}
+        key: composer-php-${{ matrix.php }}-${{ matrix.laravel }}-${{ matrix.prefer }}-${{ hashFiles('composer.json') }}
+
     - name: Install dependencies
       run: |
-        composer update --no-interaction --prefer-stable
+        composer require "illuminate/database:${{ matrix.laravel }}" "illuminate/support:${{ matrix.laravel }}" "orchestra/testbench:${{ matrix.testbench }}" "orchestra/database:${{ matrix.testbench }}" --no-interaction --no-update
+        composer update --${{ matrix.prefer }} --prefer-dist --no-interaction --no-suggest
+
     - name: Run tests
       run: |
         CACHE_DRIVER=array phpunit --coverage-text --coverage-clover=coverage_array.xml
         CACHE_DRIVER=file phpunit --coverage-text --coverage-clover=coverage_file.xml
+
     - uses: codecov/codecov-action@v1
       with:
         fail_ci_if_error: false