WIP: Replace gradle-witness with checksum-dependency plugin

Closed Julian Dehm requested to merge goapunk/briar:replace_gradle_witness into master

Something I played around with following @vlsi hint here: #1488 (comment 38104) Feels much smoother than gradle witness and is actively maintained by @vlsi - so might be worth a look.

Switching between GPG and SHA512 is as easy as it gets. I used the default of GPG and sha512 as fallback here, sha512 only might be safer though?

Solves #1613

Edited by Julian Dehm

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