Add code coverage support fo CI

.github/workflows/continuous-integration.yml.tpl

@@ -1,5 +1,8 @@
 name: "Continuous integration"
 
+# Code coverage is automatically enabled when a `.glpi-coverage.json` file
+# is present at the root of the plugin directory.
+
 on:
   push:
     branches:
@@ -33,3 +36,9 @@ jobs:
       glpi-version: "${{ matrix.glpi-version }}"
       php-version: "${{ matrix.php-version }}"
       db-image: "${{ matrix.db-image }}"
+
+  coverage-report:
+    needs: "ci"
+    uses: "glpi-project/plugin-ci-workflows/.github/workflows/coverage-report.yml@v1"
+    with:
+      plugin-key: "{LNAME}"

.glpi-coverage.json

@@ -0,0 +1,3 @@
+{
+  "enabled": false
+}

README.md

@@ -31,6 +31,13 @@ You can also provide a destination path (ie. if your `empty` directory is not in
 * `{UNAME}` will be replaced by the uppercased name,
 * `{YEAR}` will be replaced by the current year.
 
+## Enabling Code coverage
+By default, code coverage is disabled.
+
+You can enable it by updating the `.glpi-coverage.json`.
+
+Configuration defaults and explanations are available [here](https://github.com/glpi-project/plugin-ci-workflows#code-coverage).
+
 ## Updating Your Plugin
 
 To import the changes made to the _pluginsGLPI empty_ template into your project,