digest for .map files

[gfrivolt]

We would like to use map files also on staging and/or production, tools like sentry can give us more helpful error reports if we attach them. I see that maps have no digests added to the name. Can you give me a hint how I could add the digest to them? I'd try to add this possibility. Thank you.

[gfrivolt]

my dirty, but working attempt here https://github.com/netronixgroup/digest-brunch