Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -52,6 +52,7 @@ build:
     - echo "Docker Registry :" ${DOCKER_REGISTRY}
     - echo "Docker Username :" ${DOCKER_USERNAME}
     - echo "Docker Passowrd :" ${DOCKER_PASSWORD}
+    - echo "${DOCKER_PASSWORD}" | docker login -u "${DOCKER_USERNAME}" --password-stdin "${DOCKER_REGISTRY}"
   script:
     - echo "Building image..."
   after_script: