oranda generate should add public to gitignore

[konstin]

I ran oranda build and oranda serve to setup oranda. Then i ran oranda generate ci --ci=github to add oranda to the repository. If i now look at git status, i get:

On branch main
Your branch is up to date with 'origin/main'.

Untracked files:
  (use "git add <file>..." to include in what will be committed)
	.github/workflows/web.yml
	public/

nothing added to commit but untracked files present (use "git add" to track)

The generate command should ideally add ephemeral directories created by orange to .gitignore.