Create .gitlab-ci.yml file

.gitlab-ci.yml

+stages:
+  - build-testar-api
+  - build-testar-docker
+
+build-testar-api:
+  image: maven:3.6.3-openjdk-11
+  stage: build-testar-api
+  script:
+    - 'mvn clean'
+    - 'mvn install'
+
+build-testar-docker:
+  image: docker:20.10.2
+  stage: build-testar-docker
+  services:
+    - docker:20.10.2-dind
+  variables:
+    IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+  script:
+    - echo $IMAGE_TAG
+    - docker build -t $IMAGE_TAG .
+    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+    - docker push $IMAGE_TAG
\ No newline at end of file