Replace Jenkins Git plugin checkout with a plain shell clone + retry loop

The Git plugin's checkout([...]) step doesn't expose http.postBuffer/
http.version tuning, which is what's reliably fixed every stuck
push/clone today (VPS and both laptops) — meanwhile checkout was failing
~10 times in a row, consistently dying at 84-95% during the shallow clone
(early EOF / invalid index-pack). Bypasses the plugin entirely: a plain
`git clone` with those settings applied, wrapped in its own 8-attempt
bash retry loop, using the existing dd13f593-06b1-4a5a-9477-2df0d186b490
credential (confirmed via credentials.xml to be a UsernamePasswordCredentialsImpl,
compatible with the usernamePassword binding as-is).

Code now lands in a repo/ subdirectory instead of the workspace root, so
every stage referencing a repo-relative path was updated to match:
- Build Docker Image: ./platform/ -> ./repo/platform/
- SonarQube Analysis: -Dsonar.sources=platform -> -Dsonar.sources=repo/platform
Deploy to Kubernetes needed no changes — it only references the already-built
image tag and hardcoded kubectl args, no filesystem paths into the checkout.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

platform/Jenkinsfile

@@ -14,19 +14,24 @@ pipeline {
     stages {
         stage('Checkout') {
             steps {
-                retry(5) {
-                    checkout([
-                        $class: 'GitSCM',
-                        branches: scm.branches,
-                        userRemoteConfigs: scm.userRemoteConfigs,
-                        extensions: [[
-                            $class: 'CloneOption',
-                            shallow: true,
-                            depth: 1,
-                            noTags: true,
-                            timeout: 30
-                        ]]
-                    ])
+                withCredentials([usernamePassword(
+                    credentialsId: 'dd13f593-06b1-4a5a-9477-2df0d186b490',
+                    usernameVariable: 'GIT_USER',
+                    passwordVariable: 'GIT_TOKEN'
+                )]) {
+                    sh '''
+                        rm -rf repo
+                        for i in 1 2 3 4 5 6 7 8; do
+                            echo "Clone attempt $i..."
+                            git -c http.postBuffer=524288000 -c http.version=HTTP/1.1 \
+                                clone --depth 1 \
+                                "https://$GIT_USER:$GIT_TOKEN@gitea.nav.ovh/ameniboukattaya/CloudOps.git" repo \
+                                && break
+                            rm -rf repo
+                            sleep 3
+                        done
+                        test -d repo/.git
+                    '''
                 }
             }
         }
@@ -34,7 +39,7 @@ pipeline {
         stage('Build Docker Image') {
             steps {
                 sh '''
-                    docker build -t management-platform:${BUILD_NUMBER} -t management-platform:latest ./platform/
+                    docker build -t management-platform:${BUILD_NUMBER} -t management-platform:latest ./repo/platform/
                     echo "✅ Docker image built"
                     docker images management-platform:${BUILD_NUMBER} --format "Size: {{.Size}}"
                 '''
@@ -50,7 +55,7 @@ pipeline {
                             sh """
                                 ${scannerHome}/bin/sonar-scanner \
                                   -Dsonar.projectKey=management-platform \
-                                  -Dsonar.sources=platform \
+                                  -Dsonar.sources=repo/platform \
                                   -Dsonar.python.version=3
                             """
                         }