Fix

.gitlab-ci.yml

@@ -8,6 +8,9 @@ stages:
 variables:
     PIP_CACHE_DIR: "$CI_PROJECT_DIR/.cache/pip"
 
+before_script:
+    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+
 docs:
   stage: test
   image: it4innovations/docker-mdcheck:latest
@@ -107,7 +110,7 @@ docker-build:
         tag=""
         echo "Running on default branch '$CI_DEFAULT_BRANCH': tag = 'latest'"
       else
-        tag=":$CI_COMMIT_REF_SLUG"
+        tag=":$CI_COMMIT_REF_NAME"
         echo "Running on branch '$CI_COMMIT_BRANCH': tag = $tag"
       fi
     - docker build --pull -t "$CI_REGISTRY_IMAGE${tag}" .
@@ -119,7 +122,7 @@ docker-build:
 
 mkdocs:
   image: 
-      name: "http://registry.gitlab.ics.muni.cz:443/einfra-docs/documentation:${CI_COMMIT_REF_SLUG}"
+      name: "${CI_REGISTRY_IMAGE}:${CI_COMMIT_REF_NAME}"
       entrypoint: ["/bin/sh", "-c"]
   stage: build
   script: