Make Tails built iso name more unique

We actually are keeping only one build per day on our nigthly archives, as the Tails iso name contains only the day of the build.

We could keep more builds per day as specified in the parent ticket by adding the hour and minute in the name of the built iso (%Y%m%d%H%M in place of %Y%m%d defined by AMNESIA_TODAY).

This shouldn’t break the different scripts using /etc/amnesia/version. At least perl’s DateTime::Format::ISO8601::parse_datetime used in tails-security-check seems to understand this format.

Feature Branch: feature/More_uniq_built_iso_name_in_jenkins

Parent Task: #6195 (closed)

Original created by @bertagaz on 6248 (Redmine)