[#79]: Update Github Workflows to trigger upon PR

[ashercuedo]

Issue reference:
In reference to #79

• Added the 'pull_request' element to the yml so that now all workflows should be triggered on any event for any pull request in any branch

Submission Checklist:

• Have you followed the guidelines in our Contributing document (for example, is your tree a clean merge)?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Does your submission build?
• Does your submission pass tests?
• Have you run lints on your code locally prior to submission?
• Have you updated all of the cabal/nix infrastructure?
• Is this a breaking change? Have you discussed this?