ci: Implement docker build & docker push

.gitlab-ci.yml

@@ -23,7 +23,7 @@ build:executable:
     paths:
       - lib
 
-build:dockerimage:
+build:docker-image:
   stage: build
   image: docker:20.10.16
   services:
@@ -31,7 +31,7 @@ build:dockerimage:
   needs:
     - build:executable
   script:
-    - make build
+    - make docker-build
   artifacts:
     paths:
       - bin
@@ -42,10 +42,12 @@ build:dockerimage:
 sast:
   stage: test
 
-publish_job:
+publish:docker-image:
   stage: publish
+  needs:
+    - build:docker-image
   script:
-    - echo "Not implemented yet"
+    - make docker-push
   artifacts:
     paths:
       - bin