ADD: added gitlab ci yaml

.gitlab-ci.yml

@@ -0,0 +1,22 @@
+stages:
+  - build
+
+variables:
+  IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA
+  IMAGE_LATEST: $CI_REGISTRY_IMAGE:latest
+
+build-docker:
+  stage: build
+  image: docker:27
+  services:
+    - docker:27-dind
+  variables:
+    DOCKER_TLS_CERTDIR: "/certs"
+  before_script:
+    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+  script:
+    - docker build --pull -t $IMAGE_TAG -t $IMAGE_LATEST .
+    - docker push $IMAGE_TAG
+    - docker push $IMAGE_LATEST
+  rules:
+    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH