Improve CI Checks

[MattPereira]

Overview

I couldn't figure out deploying contracts to an anvil fork as part of the CI checks in #53. The yarn fork command executes successfully to start an anvil fork of sepolia as part of the GHA, but it would hang indefinitely instead of moving on to the next step to deploy the contracts

[johngrantuk]

I remember I had a similar issue a long time ago - I think I needed to add ampersand at the end of the command, so try: yarn fork &

[brunoguerios]

True! That's how it's setup on the old SDK