Add CI that tests reproducability success and failure

.gitlab-ci.yml

+image: docker:git
+
+services:
+- docker:dind
+
+stages:
+- build
+- test
+- release
+
+variables:
+  TEST_IMAGE: registry.gitlab.com/${CI_PROJECT_NAMESPACE}/${CI_PROJECT_NAME}:${CI_BUILD_REF_NAME}
+  RELEASE_IMAGE: registry.gitlab.com/${CI_PROJECT_NAMESPACE}/${CI_PROJECT_NAME}:latest
+
+before_script:
+  - echo ${CI_BUILD_TOKEN} | docker login -u gitlab-ci-token --password-stdin registry.gitlab.com
+
+build:
+  stage: build
+  script:
+    - docker build -t ${TEST_IMAGE} .
+    - docker push $TEST_IMAGE
+
+test_success:
+  stage: test
+  script:
+    - docker run ${TEST_IMAGE} ./reproduce.py release-1.0.1
+
+test_failure:
+  stage: test
+  script:
+    - ! docker run ${TEST_IMAGE} ./reproduce.py release-1.0.3
+
+release:
+  stage: release
+  script:
+    - docker pull $TEST_IMAGE
+    - docker tag $TEST_IMAGE $RELEASE_IMAGE
+    - docker push $RELEASE_IMAGE
+  only:
+    - master
+    - tags