Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -18,8 +18,8 @@ build_image:
   tags:
   - redshift
   script:
-    - docker pull $CI_REGISTRY_IMAGE:$IMAGE_TAG || true
-    - docker build --cache-from $CI_REGISTRY_IMAGE:$IMAGE_TAG --pull -t "$CI_REGISTRY_IMAGE:$IMAGE_TAG" .
+    - docker pull $CI_REGISTRY_IMAGE:$CI_BUILD_TAG || true
+    - docker build --cache-from $CI_REGISTRY_IMAGE:$CI_BUILD_TAG --pull -t "$CI_REGISTRY_IMAGE:$CI_BUILD_TAG" .
 
     - docker login -u "duniterteam" -p "$DUNITERTEAM_PASSWD"
     - docker tag "$CI_REGISTRY_IMAGE:$CI_BUILD_TAG" "duniter/rust-x64-stable-ci:$CI_BUILD_TAG"