on pull l'image avant de la tagguer

.gitlab-ci.yml

@@ -26,6 +26,10 @@ deploy-github:
   stage: "deploy"
   before_script:
     - docker login -u "$GITHUB_USER" -p "$GITHUB_PASSWORD"
+    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
   script:
+    - docker pull "$CI_REGISTRY_IMAGE"
     - docker tag "$CI_REGISTRY_IMAGE" "$GITHUB_USER/$GITHUB_PROJECT"
     - docker push "$GITHUB_USER/$GITHUB_PROJECT"
+  only:
+    - master