ci: publish JUnit and coverage reports

Jenkinsfile

@@ -162,6 +162,21 @@ pipeline {
                       "
                 '''
             }
+
+	post {
+            always {
+               junit(
+                   testResults: 'backend/test-results/*.xml',
+                   allowEmptyResults: true
+               )
+
+               archiveArtifacts(
+                   artifacts: 'backend/coverage/**',
+                   fingerprint: true,
+                   allowEmptyArchive: true
+               )
+            }
+          }
        }
 
         stage('Frontend - Lint et Build') {