Fetch 50 last commits to fix coverage build

Author: Jeremiah VALERIE

.github/workflows/ci.yml

@@ -185,7 +185,7 @@ jobs:
       - name: "Checkout"
         uses: "actions/checkout@v2"
         with:
-          ref: ${{ github.ref }}
+          fetch-depth: 50
 
       - name: "Install PHP with coverage"
         uses: "shivammathur/setup-php@v2"