reproducibly_build_Tails_ISO_* Jenkins job are broken

It would be nice to have CI again for reproducible builds, given we would like 3.0 to be reproducible (BTW I’m going to create a similar job for feature/stretch).

See e.g. https://jenkins.tails.boum.org/job/reproducibly_build_Tails_ISO_feature-5630-deterministic-builds/1/console: it seems that mv tails-* build-artifacts/ should be adjusted to the place where artifacts now land.

Parent Task: #5630 (closed)

Related issues

Related to #12599 (closed)

Original created by @intrigeri on 12579 (Redmine)

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