gitlab variable transfer a file to remote server

.gitlab-ci.yml

+stages: 
+    - build 
+
+build api: 
+    stage: build
+    image: ubuntu
+    before_script:
+        - 'which ssh-agent || ( apt-get update -y && apt-get install openssh-client -y )'
+        - eval $(ssh-agent -s)
+        - mkdir -p ~/.ssh
+        - chmod 700 ~/.ssh
+        - echo "$CENTOS_SERVER" | ssh-add - > ~/.ssh/id_rsa
+        - '[[ -f /.dockerenv ]] && echo -e "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config'
+        - apt-get install git-core -y
+        - ssh -tt centos@13.251.192.208 "cd /var/www/gitlab_variable_red && sudo git clone http://tir:Qwerty1234@http://54.169.104.100:27015/red/red-ci-cd.git -b $backend"
+        - ssh -tt centos@13.251.192.208 "cd /var/www/gitlab_variable_red && sudo echo > ${docker-compose.yml}"
+        - ssh -tt centos@13.251.192.208 "cd /var/www/gitlab_variable_red && sudo echo > ${docker-compose.yml}"
+        - ssh -tt centos@13.251.192.208 "cd /var/www/gitlab_variable_red && sudo echo > ${env.ini}"
+    variables:
+      GIT_STRATEGY: clone
+      GIT_DEPTH: "3600"
+    script: 
+        - git branch
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