Set bun version in bunfig file

[SrBrahma]

I already had a situation in which, due to a mismatch in the bun's version used in CI and local bun, some errors were occurring in the lock file.

While in the CI we can specify the bun version, apparently there is no way to enforce project's users to use a specific bun version.

Can we have a field in bunfig that if bun -v is not that version, it would automatically install that version when bun i is run?

This would make upgrades to bun in our setup easier as we wouldn't need to tell the devs to upgrade bun.