bash 3.2/4.4 static versions

[robxu9]

From #17 - there are use cases for testing with old bash versions - mainly for macOS, which still uses bash 3.2 and may utilise deployment scripts. Consider building 3.2/4.4 versions.

[AfroThundr3007730]

This is handled with the changes in #47 enabling multi-version support via switch.