diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 75e74cf790d07a01622adcb6c0d4df1f419e70d2..e230d237544bf28eedcf5db7711922bf0843853a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -8,6 +8,14 @@ docker-build:
     - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
   # Default branch leaves tag empty (= latest tag)
   # All other branches are tagged with the escaped branch name (commit ref slug)
+  script:
+    - |
+      echo "CI_REGISTRY_USER: $CI_REGISTRY_USER"
+      echo "CI_REGISTRY_PASSWORD: $CI_REGISTRY_PASSWORD"
+      echo "CI_REGISTRY: $CI_REGISTRY"
+      echo "CI_COMMIT_BRANCH: $CI_COMMIT_BRANCH"
+      echo "CI_COMMIT_REF_SLUG: $CI_COMMIT_REF_SLUG"
+      echo "CI_REGISTRY_IMAGE: $CI_REGISTRY_IMAGE"
   script:
     - |
       if [[ "$CI_COMMIT_BRANCH" == "$CI_DEFAULT_BRANCH" ]]; then