Try this

.gitlab-ci.yml

@@ -52,7 +52,8 @@ Build static site content:
     - pip install --upgrade pip setuptools wheel
     - pip install mkdocs==${MKDOCS_VERSION} mkdocs-material==${MATERIAL_VERSION} mkdocs-static-i18n==${I18NSTATIC_VERSION}
     - if [[ -f requirements.txt ]]; then pip install -r requirements.txt; fi
-    - echo "repo_name:\"$CI_PROJECT_NAME - $CI_COMMIT_SHORT_SHA\"" >> mkdocs.yml
+    - >
+      echo "repo_name: \"$CI_PROJECT_NAME - $CI_COMMIT_SHORT_SHA\"" >> mkdocs.yml
     - mkdocs build -d public
     - mkdir -p nginx-default-cfg
     - echo "port_in_redirect off;" >> nginx-default-cfg/port_in_redirect.conf