Image build is optimized.

.gitlab-ci.yml

@@ -49,5 +49,9 @@ deploy:
   stage: deploy
   dependencies:
     - build
+  image: docker:dind
+  services:
+    - name: docker:dind
+      command: ["--tls=false", "--storage-driver=overlay2", "--mtu=1500", "--data-root=/mnt/volume"]
   script:
     - docker run -d flask-backend-full
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