* Pull latest changes from ref using cached repo
Act switched from checking out a branch to checking out
a hash in order to resolve#24 - see
bc5c23e8e4
This had a side effect of preventing `w.Pull()` from updating
to the latest commit if a ref was a branch/tag and the repo
already exists on disk.
This commit checks if input.Ref is equivalent to the resolved
hash, and runs `r.Fetch()` and checks out the branch for input.Ref
if it is different. `w.Pull()` can then pull the latest changes
before we checkout `*hash` again like normal
* Extract CloneIfRequired to reduce cyclomatic complexity
Co-authored-by: Casey Lee <cplee@nektos.com>
