Change the management of the cache of composer

.github/workflows/continuous-integration.yml

@@ -15,7 +15,6 @@ on:
 
 env:
   fail-fast: true
-  COMPOSER_ROOT_VERSION: "1.4"
 
 jobs:
   phpunit:
@@ -48,14 +47,19 @@ jobs:
         uses: "shivammathur/setup-php@v2"
         with:
           php-version: "${{ matrix.php-version }}"
+          tools: composer
           coverage: "none"
 
-      - name: "Cache dependencies installed with composer"
+      - name: Get composer cache directory
-        uses: "actions/cache@v2"
+        id: composercache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
         with:
-          path: "~/.composer/cache"
+          path: ${{ steps.composercache.outputs.dir }}
-          key: "php-${{ matrix.php-version }}-composer-locked-${{ hashFiles('composer.lock') }}"
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
-          restore-keys: "php-${{ matrix.php-version }}-composer-locked-"
+          restore-keys: ${{ runner.os }}-composer-
 
       - name: "Install dependencies with composer"
         env: