FIX: image with zip command

.gitlab-ci.yml

@@ -2,10 +2,9 @@ stages:
   - build
   - publish
 
-image: node:latest
-
 build-and-clean:
   stage: build
+  image: node:latest
   script:
     - npm install
     - npm run postinstall
@@ -20,6 +19,7 @@ build-and-clean:
 
 pages:
   stage: publish
+  image: kramos/alpine-zip
   script:
     - mv public gsper
     - tar cJf gsper-offline.tar.xz gsper/