Run an IO action while constructing the spec tree.
SpecM is a monad to construct a spec tree, without executing
any spec items.
runIO allows you to run IO actions during
this construction phase. The IO action is always run when the spec
tree is constructed (e.g. even when
--dry-run is specified).
If you do not need the result of the IO action to construct the spec
tree,
beforeAll may be more suitable for your use case.