Fix test coverage workflow

Author: eel76-hmi

.github/workflows/coverage.yml

@@ -11,6 +11,9 @@ jobs:
     runs-on: 'ubuntu-24.04'
 
     steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
     - name: Check test coverage
       uses: ./.github/actions/devcontainer
       with:
@@ -26,4 +29,3 @@ jobs:
       with:
         filename: coverage.cobertura.xml
         badge: true
-