Use apksigner instead of jarsigner
projects/tor-browser/build.android we currently use jarsigner to sign the apk.
In order to make the build reproducible, we run it with faketime. However doing that leads to a stalled build on Stretch, so we are using Buster as a workaround.
According to eighthave this issue might be solved by using apksigner instead of jarsigner: https://trac.torproject.org/projects/tor/ticket/29981#comment:4