If you get root privileges

[mpv945]

I'm sorry.
Ask a more elementary question
Enter the container, you can't modify external-scripts.json, you want to install vim, you can't execute sudo apt install VIM

[caggles]

Why are you trying to modify external-scripts.json on the container? You should change it in your IDE and then build an image to put on the container. Any changes made on a container platform will not persist between deployments.