fix: share Jenkins workspace with CI containers

Jenkinsfile

@@ -10,11 +10,7 @@ pipeline {
     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 {
@@ -28,9 +24,10 @@ pipeline {
             steps {
                 sh '''
                     echo "Workspace Jenkins : ${WORKSPACE}"
-                    echo "Workspace hôte    : ${HOST_WORKSPACE}"
 
                     ls -lah backend
+                    ls -lah frontend
+
                     test -f backend/package.json
                     test -f backend/package-lock.json
                     test -f frontend/package.json
@@ -72,13 +69,13 @@ pipeline {
 
                     docker run --rm \
                       --network "${CI_NETWORK}" \
+                      --volumes-from furious-jenkins \
                       --user "$(id -u):$(id -g)" \
                       -e HOME=/tmp \
                       -e DATABASE_URL="${DATABASE_URL}" \
                       -e JWT_SECRET=jenkins_ci_secret \
                       -e NODE_ENV=test \
-                      -v "${HOST_WORKSPACE}/backend:/app" \
-                      -w /app \
+                      -w "${WORKSPACE}/backend" \
                       node:22-alpine \
                       sh -c "
                         npm ci &&
@@ -94,10 +91,10 @@ pipeline {
             steps {
                 sh '''
                     docker run --rm \
+                      --volumes-from furious-jenkins \
                       --user "$(id -u):$(id -g)" \
                       -e HOME=/tmp \
-                      -v "${HOST_WORKSPACE}/frontend:/app" \
-                      -w /app \
+                      -w "${WORKSPACE}/frontend" \
                       node:22-alpine \
                       sh -c "
                         npm ci &&
@@ -111,8 +108,6 @@ pipeline {
         stage('Docker Build') {
             steps {
                 sh '''
-                    cd "${WORKSPACE}"
-
                     docker compose \
                       -f docker-compose.dev.yml \
                       build