fix syntax

Jenkinsfile

@@ -74,7 +74,7 @@ pipeline {
           steps {
             dir(path: 'src/backend') {
               sh 'APP_SECRET=`php8.0 -r "echo md5(\\"branch=${BRANCH_NAME};\\");"` && sed -i "s/APP_SECRET=.*/APP_SECRET=${APP_SECRET}/g" .env'
-              sh 'sed -i "s/DATABASE_URL=.*/DATABASE_URL=${DatabaseUrlTesting}/g" .env.test'
+              sh '''sed -i 's/DATABASE_URL=.*/DATABASE_URL=${DatabaseUrlTesting}/g' .env.test'''
               sh 'composer dump-env test'
               sh 'php8.0 bin/console doctrine:schema:update --force';
             }