Merge branch 'shared-runner-docker' into 'master'

Shared runner docker

See merge request !3

.gitlab-ci.yml

 stages:
+        - build_docker
         - build
         - test
         - staging
         - production
 
 variables:
-        PORT: 5000        
-        DOCKER_DRIVER: overlay
-        CONTAINER_TEST_IMAGE: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
-        CONTAINER_RELEASE_IMAGE: $CI_REGISTRY_IMAGE:latest
+        PORT: 5000      
+        DOCKER_IMAGE: $CI_REGISTRY_IMAGE
+        DOCKER_IMAGE_LATEST: $CI_REGISTRY_IMAGE:latest
+
+build docker:   
+        stage: build_docker
+        tags:
+                - ljt18_webapp
+        script:
+                - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+                - docker system prune -f 
+                - docker build -t $DOCKER_IMAGE .
+                - docker push $DOCKER_IMAGE
 
 compile:
         stage: build
-        image: $CONTAINER_TEST_IMAGE
+        image: $DOCKER_IMAGE_LATEST 
         script: 
                 - mvn compile
+
 test:
         stage: test
-        image: $CONTAINER_TEST_IMAGE
+        image: $DOCKER_IMAGE_LATEST 
         script: 
                 - mvn test
 
@@ -37,10 +48,8 @@ deploy to vm:
 
 deploy to heroku: 
         stage: production
+        image: $DOCKER_IMAGE_LATEST 
         script:
-                - apt-get update
-                - apt-get install ruby
-                - gem install --user-install dpl-heroku
                 - dpl --provider=heroku --app=ljt18-simplewebapp --api-key=$API_KEY
         environment: 
                 name: Heroku

Dockerfile

 FROM ubuntu:latest
 
 RUN apt-get -y update \
-&& apt-get -y install maven openjdk-11-jre openjdk-11-jdk pandoc
+&& apt-get -y install git maven openjdk-11-jre openjdk-11-jdk pandoc ruby=1:2.5.1 curl 
+RUN gem install dpl-heroku -v 1.10.14
 
 COPY src /src
 COPY system.properties /system.properties
 COPY pom.xml /pom.xml
 
 RUN mvn package
+ENV PATH /var/lib/ruby/2.5.0/bin:$PATH
+
+CMD ["sh", "target/bin/simplewebapp"]