created.rid: use SOURCE_DATE_EPOCH

[bmwiedemann]

use SOURCE_DATE_EPOCH instead of current time in created.rid top line
to enable reproducible builds of ruby docs

See https://reproducible-builds.org/ for why this is good
and https://reproducible-builds.org/specs/source-date-epoch/
for the definition of this variable.

[aycabta]

OK, I understand what you want to do. It's very great for my RDoc development.

[aycabta]

I added a test for this at 8194612.

[aycabta]

Commented: https://bugs.ruby-lang.org/issues/13627#change-69519

[utkarsh2102]

Hm, I think this doesn't seem to work.
Reproducibility of ruby-dbus is affected because of rdoc:
ruby-dbus.txt

Any clue what's wrong? :)

[bmwiedemann]

@utkarsh2102 Looks like a different issue with mtimes in data.tar.xz - shouldnt those be normalized by dpkg via SOURCE_DATE_EPOCH ?