add gitlab, remove travis configs

Author: Nico640

.gitlab-ci.yml

@@ -0,0 +1,9 @@
+before_script:
+  - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD
+
+build:
+  stage: build
+  script:
+    - docker build -t $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA -f Dockerfile.armhf .
+    - docker tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME
+    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_NAME