Predefined ignored repos for clean and update

[gleich]

Description

Allow the user to define in a config file the repos to ignore for the following commands:

• clean
• pull
• update

Config syntax should look like this:

- OWNER:
    - NAME:
      clean: false
      pull: true
      update: true
- OWNER:
  clean: true
  pull: true
  update: true

[lvndry]

I'll try to take this one

[gleich]

Nice! Lemme know if you need any help @lvndry!