minor fix

Jenkinsfile

@@ -39,7 +39,7 @@ pipeline {
                     GIT_COMMIT_HASH = sh(script: 'git rev-parse --short HEAD', returnStdout: true).trim()
                     sh '''
                         docker build -t ${DOCKER_HUB_USERNAME}/${IMAGE_NAME}:latest .
-                        docker tag ${DOCKER_HUB_USERNAME}/${IMAGE_NAME}:latest ${DOCKER_HUB_USERNAME}/${IMAGE_NAME}:${APP_GIT_HASH}
+                        docker tag ${DOCKER_HUB_USERNAME}/${IMAGE_NAME}:latest ${DOCKER_HUB_USERNAME}/${IMAGE_NAME}:${GIT_COMMIT_HASH}
                     '''
                 }
             }
@@ -50,7 +50,7 @@ pipeline {
                 GIT_COMMIT_HASH = sh(script: 'git rev-parse --short HEAD', returnStdout: true).trim()
                 sh '''
                     # Push both tags
-                    docker push ${DOCKER_HUB_USERNAME}/${IMAGE_NAME}:${APP_GIT_HASH}
+                    docker push ${DOCKER_HUB_USERNAME}/${IMAGE_NAME}:${GIT_COMMIT_HASH}
                     docker push ${DOCKER_HUB_USERNAME}/${IMAGE_NAME}:latest
                 '''
             }