ci: switch to ramsey/composer-install (#111)

Author: dunglas

.github/workflows/tests.yml

@@ -7,15 +7,18 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
+        php-version:
+          - "7.1"
+          - "7.2"
+          - "7.3"
+          - "7.4"
+          - "8.0"
+          - "8.1"
+        dependencies:
+          - highest
         include:
-          - php-version: "7.1"
-          - php-version: "7.2"
-          - php-version: "7.3"
-          - php-version: "7.4"
-          - php-version: "8.0"
           - php-version: "8.1"
-          - php-version: "8.1"
-            prefer: lowest
+            dependencies: lowest
 
     steps:
       - name: Start MySQL
@@ -41,24 +44,10 @@ jobs:
           php-version: ${{ matrix.php-version }}
           extensions: mbstring, xml, ctype, iconv, intl, pdo_mysql, pdo_pgsql
 
-      - name: Get composer cache directory
-        id: composer-cache
-        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
-
-      - name: Cache dependencies
-        uses: actions/cache@v2
-        with:
-          path: ${{ steps.composer-cache.outputs.dir }}
-          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}-${{ matrix.prefer }}-
-          restore-keys: ${{ runner.os }}-composer-${{ matrix.prefer }}-
-
       - name: Install dependencies
-        if: ${{ matrix.prefer != 'lowest' }}
-        run: composer update --prefer-dist --no-interaction --no-progress
-
-      - name: Install lowest dependencies
-        if: ${{ matrix.prefer == 'lowest' }}
-        run: composer update --prefer-lowest --prefer-dist --no-interaction --no-progress
+        uses: "ramsey/composer-install@v2"
+        with:
+          dependency-versions: "${{ matrix.dependencies }}"
 
       - name: Install PHPUnit
         run: php vendor/bin/simple-phpunit install