Draft: Resolve "Extrahovat Gateway z projketu dna-analyser"

Closes #1

.gitlab-ci.yml

 variables:
   SPRING_PROFILES_ACTIVE: gitlab
 
+services:
+  - docker:dind
+
 cache:
   untracked: true
   key: "$CI_COMMIT_MESSAGE"
@@ -50,9 +53,13 @@ gradlew-bootJar:
 
 docker-build:
   stage: build
-  image: docker:dind
+  image: docker:git
   script:
-    - docker build -t $DOCKER_NAMESPACE/gateway:latest .
+    - docker build -t $DOCKER_NAMESPACE/gateway:$TAG .
+    - docker save -o build/image.tar $DOCKER_NAMESPACE/gateway:$TAG
+  artifacts:
+    paths:
+      - build/image.tar
 
 # ===========================================================================
 # Stage: test
@@ -82,17 +89,18 @@ verification-env:
 # Stage: publish
 # ===========================================================================
 
-publish:
+docker-push:
   stage: publish
+  image: docker
   only:
     - master
     - /^verze_\d+\.\d+\.\d+$/
   before_script:
-    - export $(xargs < .env)
     - docker login -u $DOCKER_USERNAME -p $DOCKER_PASSWORD
   script:
+    - docker load -i build/image.tar
     - docker push $DOCKER_NAMESPACE/gateway:$TAG
-
+          
 # ===========================================================================
 # Stage: deploy
 # ===========================================================================