Feat: CI/CD + Dependabot for `Go` Project

[nelsonic]

In light of https://github.com/dwyl/learn-go/issues/5#issuecomment-2212051570 🎉 We need to:

• [ ] showcase basic testing, CI/CD (with GitHub Actions)
• [ ] and @dependabot in this repo.

[nelsonic]

https://gobyexample.com/

[nelsonic]

If you see the following:

zsh: command not found: go

Run:

brew install go

Then:

go version

go version go1.22.5 darwin/arm64

Note: running go on a mac that hasn't yet run any go projects ...