I do this periodically with my iPad. I use Textastic which is a decent editor with it's SSH mode.

There is also ShellFish, which is an iOS SSH file provider. You can use it to access any files via SSH as if they were from iCloud or OneDrive, etc.

Lastly, there is code-server, which is VS Code in a browser. I've used this from time to time, and it works well.