fix: use host Jenkins workspace in Docker CI

Jenkinsfile

@@ -4,12 +4,17 @@ pipeline {
     options {
         disableConcurrentBuilds()
         timestamps()
+        skipDefaultCheckout(true)
     }
 
     environment {
         CI_NETWORK = "tiptop-ci-${BUILD_NUMBER}"
         CI_DATABASE = "tiptop-ci-db-${BUILD_NUMBER}"
+
         DATABASE_URL = "postgresql://tiptop_ci:tiptop_ci_password@${CI_DATABASE}:5432/the_tip_top_ci"
+
+        HOST_JENKINS_HOME = "/opt/furious-ducks/data/jenkins"
+        HOST_WORKSPACE = "${HOST_JENKINS_HOME}/workspace/${JOB_NAME}"
     }
 
     stages {
@@ -19,6 +24,21 @@ pipeline {
             }
         }
 
+        stage('Vérification du workspace') {
+            steps {
+                sh '''
+                    echo "Workspace Jenkins : ${WORKSPACE}"
+                    echo "Workspace hôte    : ${HOST_WORKSPACE}"
+
+                    ls -lah backend
+                    test -f backend/package.json
+                    test -f backend/package-lock.json
+                    test -f frontend/package.json
+                    test -f frontend/package-lock.json
+                '''
+            }
+        }
+
         stage('Backend - Tests') {
             steps {
                 sh '''
@@ -43,6 +63,7 @@ pipeline {
 
                       if [ "$i" -eq 30 ]; then
                         echo "PostgreSQL ne répond pas."
+                        docker logs "${CI_DATABASE}"
                         exit 1
                       fi
 
@@ -56,7 +77,7 @@ pipeline {
                       -e DATABASE_URL="${DATABASE_URL}" \
                       -e JWT_SECRET=jenkins_ci_secret \
                       -e NODE_ENV=test \
-                      -v "${WORKSPACE}/backend:/app" \
+                      -v "${HOST_WORKSPACE}/backend:/app" \
                       -w /app \
                       node:22-alpine \
                       sh -c "
@@ -75,7 +96,7 @@ pipeline {
                     docker run --rm \
                       --user "$(id -u):$(id -g)" \
                       -e HOME=/tmp \
-                      -v "${WORKSPACE}/frontend:/app" \
+                      -v "${HOST_WORKSPACE}/frontend:/app" \
                       -w /app \
                       node:22-alpine \
                       sh -c "
@@ -90,6 +111,8 @@ pipeline {
         stage('Docker Build') {
             steps {
                 sh '''
+                    cd "${WORKSPACE}"
+
                     docker compose \
                       -f docker-compose.dev.yml \
                       build
@@ -104,8 +127,6 @@ pipeline {
                 docker rm -f "${CI_DATABASE}" 2>/dev/null || true
                 docker network rm "${CI_NETWORK}" 2>/dev/null || true
             '''
-
-            deleteDir()
         }
 
         success {