Feat/MDD-220: Improve Proxy Docker Container (#18)

## Feat/MDD-220: Improve Proxy Docker Container
### Update Information
This release added a new misp-dockerized-proxy Docker container.
### General Changes
The general CI files were changed.
- Changed Gitlab CI Build tools from default `docker build`  to `kaniko`
- Added a Gitlab CI test job for all container 
- Added a Release Date variable for all container 
- Removed unused CI scripts
### Fixes and Improvements
- Added new misp-dockerized-proxy:1.6-alpine Docker container
### Detailed Changes
- Added new misp-dockerized-proxy:1.6-alpine Docker container
  This container supports: 
  - Our MISP-dockerized-monitoring as reverse proxy. 
  - The new MISP-dockerized variable scheme.
  - SSL web certificate passphrase option.

.gitlab-ci.yml

@@ -1,54 +1,22 @@
-image: docker:latest
 
-services:
-  - docker:dind
 
-stages:
-- test
-- build
+notify:
+  extends: .notify
 
 variables:
-  # The following variables are setup via gitlab project group:
-  # DOCKER_HUB_NOTIFY_URL
-  # DOCKER_SLUG
-  # DOCKER_USERNAME
-  # DOCKER_PASSWORD
-  # CUSTOM_REGISTRY_URL
-  # CUSTOM_REGISTRY_USER
-  # CUSTOM_REGISTRY_PW
-
-before_script:
-- .ci/01_before_install.sh
-
-.test:
-  stage: test
-  except: 
-  - master  
-  script:
-  - make -C .ci build v=$VERSION
-  - make -C .ci tags REPOURL=$CUSTOM_REGISTRY_URL
-  - make -C .ci tags REPOURL=$DOCKER_SLUG
-
-.build:
-  stage: build
-  only: 
-  - master
-  script:
-  - make -C .ci build v=$VERSION 
-  - make -C .ci tags REPOURL=$CUSTOM_REGISTRY_URL
-  - make -C .ci tags REPOURL=$DOCKER_SLUG
-  - make -C .ci push REPOURL=$CUSTOM_REGISTRY_URL USER=$CUSTOM_REGISTRY_USER PW=$CUSTOM_REGISTRY_PW
-  - make -C .ci push REPOURL=$DOCKER_SLUG USER=$DOCKER_USERNAME PW=$DOCKER_PASSWORD
-  - make -C .ci notify-hub-docker-com URL=$DOCKER_HUB_NOTIFY_URL
+  COMPONENT: proxy
 
+include:
+  - project: 'MISP/helper-containers'
+    ref: master
+    file: '/.gitlab-ci-template.yml'
 #
 # For a cleaner Gitlab CI file include all subfolder which should be build:
 #
-include:
-  - '.legacy/.gitlab-ci.yml'
-  #- '1.0-alpine/.gitlab-ci.yml'
-  #- '1.1-alpine/.gitlab-ci.yml'
-  #- '1.2-alpine/.gitlab-ci.yml'
+  - '1.0-alpine/.gitlab-ci.yml'
+  - '1.1-alpine/.gitlab-ci.yml'
+  - '1.2-alpine/.gitlab-ci.yml'
   #- '1.3-alpine/.gitlab-ci.yml'
   #- '1.4-alpine/.gitlab-ci.yml'
-  - '1.5-alpine/.gitlab-ci.yml'
+  #- '1.5-alpine/.gitlab-ci.yml'
+  - '1.6-alpine/.gitlab-ci.yml'