reproducibly_build_Tails_ISO_*: bypass Jenkins for retrieving artifacts
This would save a few minutes from the runtime of these jobs (details): #17744 (closed).
To do so, we could replace usage of copyartifact
with a home-made script that downloads over HTTP from nightly.t.b.o, so that the Jenkins master CPU bottleneck is out of the way. Parameters:
- base URL that links to a directory listing such as https://nightly.tails.boum.org/build_Tails_ISO_stable/lastSuccessful/archive/build-artifacts/
- list of globs to download from that directory, such as
tails-*.list,tails-*.iso,tails-*.img
- destination directory