implemented action on itself

[Bullrich]

Resolves #6

This PR implements the GitHub action on itself (so we can test it every time!)

Until https://github.com/paritytech/internal_it/issues/205 is resolved, this PR should not be merged (and we need to update the keys and token generation step)

In the meanwhile, I added a temporary token (that expires in one week).

Changes

• Fixed validation of rules not setting default values.
  • Fixed basic rule amount of review to be a positive integer (min value 1)
    • Added a test to verify this
• Implemented GitHub Action to run on Pull Requests.
• Added a log which reports what teams and users are missing.
• Fixed a bug where the approvals wasn’t being properly filtered.
• Fixed a bug where the system asked the author to review the PR
• Fixed the wrong default name of the config file
  • Was set to review.yml instead of review-bot.yml
• Changed rule type validation to have forced string values.
• Added logs which inform when a rule is running and if it fails.
  • Rules are executed in order, so the logs will always correspond to the current rule.
• Created tickets Validate that rules can not repeat names #32, Create a status check #33 and Config option: Count author as reviewer #34 as foreseeable problems.
• Created utility method to concatenate two arrays and removing duplicates.
  • @mutantcornholio I don’t know if EngAutomation/js has this (or if we want to add it to it)
• Fixed a bug where the users who had approved the PR was not caching.
• Fixed a glitch where the required reviews could be 0 or a negative number.
• Fixed a glitch where the rule type could be invalid.

Testing app

New test

He approved by my request, not becaused it was needed

[Bullrich]

@paritytech/opstooling with the exception of this line the PR is ready for review.

I'll remove that line before merging.

[mutantcornholio]

Looks legit