Image build is optimized.

.gitlab-ci.yml

@@ -39,6 +39,10 @@ build:
     - docker volume prune -f
   script:
     - docker build --cache-from=flask-backend-full --no-cache --progress=plain -t flask-backend-full -f flask_ml_api/Dockerfile .
+    - docker save -o flask-backend-full.tar flask-backend-full
+  artifacts:
+    paths:
+      - flask-backend-full.tar
   cache:
     key: build-cache
     paths:
@@ -53,5 +57,7 @@ deploy:
   services:
     - name: docker:dind
       command: ["--tls=false", "--storage-driver=overlay2", "--mtu=1500", "--data-root=/mnt/volume"]
+  before_script:
+    - docker load -i flask-backend-full.tar
   script:
     - docker run -d flask-backend-full