Resolve "Improve pipeline speed"

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

Closes #126 (closed)

build/ci/.build-container.yml

 variables:
   DOCKER_TLS_CERTDIR: "/certs"
 
-.build: &build
+build_testing:
   before_script:
     - echo "override global before script"
+  stage: build
+  allow_failure: false
+  needs: []
+  tags:
+    - shell-builder
+  script:
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
-  image: docker:19.03.12
-  services:
-  - name: docker:19.03.12-dind
-    command: ["--registry-mirror", "http://141.100.70.170:6000", "--dns", "1.1.1.1"]
+    - docker build --build-arg GITLAB_USER=$GO_MODULES_USER --build-arg GITLAB_TOKEN=$GO_MODULES_ACCESS_TOKEN -f Dockerfile_testing -t registry.code.fbi.h-da.de/cocsn/gosdn:testing_${CI_PIPELINE_ID} .
+    - docker push registry.code.fbi.h-da.de/cocsn/gosdn:testing_${CI_PIPELINE_ID}
+
+.build: &build
+  before_script:
+    - echo "override global before script"
   stage: build
+  allow_failure: false
+  needs: []
   tags:
-    - dind
+    - shell-builder
   script:
-    - docker pull registry.code.fbi.h-da.de/cocsn/gosdn:ci_build_cache
-    - docker build --target builder --build-arg GITLAB_USER=$GO_MODULES_USER --build-arg GITLAB_TOKEN=$GO_MODULES_ACCESS_TOKEN --build-arg BUILDARGS=$BUILDARGS --cache-from registry.code.fbi.h-da.de/cocsn/gosdn:ci_build_cache -t registry.code.fbi.h-da.de/cocsn/gosdn:ci_build_cache .
-    - docker build --cache-from registry.code.fbi.h-da.de/cocsn/gosdn:ci_build_cache --build-arg GITLAB_USER=$GO_MODULES_USER --build-arg GITLAB_TOKEN=$GO_MODULES_ACCESS_TOKEN --build-arg BUILDARGS=$BUILDARGS -t $DOCKER_IMAGE_SHA .
+    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+    - docker build --build-arg GITLAB_USER=$GO_MODULES_USER --build-arg GITLAB_TOKEN=$GO_MODULES_ACCESS_TOKEN --build-arg BUILDARGS=$BUILDARGS -t $DOCKER_IMAGE_SHA .
     - docker push $DOCKER_IMAGE_SHA
     - docker tag $DOCKER_IMAGE_SHA $TAG
-    - docker tag $DOCKER_IMAGE_SHA registry.code.fbi.h-da.de/cocsn/gosdn:${CI_PIPELINE_ID}
     - docker push $TAG
-    - docker push registry.code.fbi.h-da.de/cocsn/gosdn:ci_build_cache
 
 build:develop:
   variables: