Update Push to Registry stage with secure credentials handling for DigitalOcean

Jenkinsfile

@@ -42,10 +42,21 @@ pipeline {
 
         stage('Push to Registry') {
             steps {
+                // Securely inject the token into the script
+                withCredentials([string(credentialsId: 'do-registry-token', variable: 'DO_TOKEN')]) {
                     script {
-                    echo "Pushing images to DigitalOcean..."
+                        echo "Logging into DigitalOcean Registry..."
+                        
+                        // Explicit Login: Uses the token as both user and password (DO Standard)
+                        sh 'echo $DO_TOKEN | docker login registry.digitalocean.com -u $DO_TOKEN --password-stdin'
+                        
+                        echo "Pushing images..."
                         sh "docker push ${REGISTRY_URL}/${REPO_NAME}:${BACKEND_TAG}"
                         sh "docker push ${REGISTRY_URL}/${REPO_NAME}:${FRONTEND_TAG}"
+                        
+                        // Cleanup: Logout to keep the agent secure
+                        sh 'docker logout registry.digitalocean.com'
+                    }
                 }
             }
         }