try only running npm install / grunt prod in bash instead

.gitlab-ci.yml

 pages:
     stage: build
-    image: 
-        name: node:17
-        entrypoint: ["/bin/bash"]
-
+    image: node:17
     script:
         - export NODE_OPTIONS=--max_old_space_size=2048
         - npm install -g grunt-cli 
         - git clone https://github.com/gchq/CyberChef.git
         - cd CyberChef
-        - npm install --unsafe-perm 
-        - grunt prod
+        - /bin/bash -c "npm install --unsafe-perm && grunt prod"
         - mv build/prod ../public
     artifacts:
         paths: