Support `--from-file` to allow reading repos from a text file

[stefanbuck]

When working with hundreds of repositories it would be helpful to be able to pass repos from a text file rather than having X args.

Current usage

npx @octoherd/cli -R octoherd/repo-a octoherd/repo-b octoherd/repo-c

Proposal

npx @octoherd/cli --from-file ./repo-list.txt

repo-list.txt

octoherd/repo-a 
octoherd/repo-b
octoherd/repo-c

To make working with the text file a breeze, lines starting with // or # will be ignored. I'm more than happy to submit a pull request for it if you think that would be a useful feature to have.

[gr2m]

I would prefer to support piping, as in

cat repo-list.txt | npx @octoherd/cli

that would make it more flexible. But I haven't worked on a CLI that accepts piping yet and I'm not aware of best practices. Would it be something you'd be interested to work on yourself?

[stefanbuck]

Sure, Octoherd saved me a few hours of work so more than happy to contribute back.

[gr2m]

Yay, glad to hear that it's useful :)