install docker

.gitlab-ci.yml

@@ -68,6 +68,8 @@ build_docker_frontend:
     - check_app_update
     - build_frontend
   script:
+    - sudo apt update
+    - sudo apt install -y docker.io
     - source variables.env || true
     - if [ "$NEW_COMMIT" != "true" ]; then
       echo "No new commit, skipping build";