refs tails#19051

refs sysadmin#17894

This is an attempt to fix the error described in
1d89c7c7:

    1d89c7c7

refs sysadmin#17894

refs tails#18219

refs sysadmin#17894

This will make it easier to maintain and diff in the future.

refs sysadmin#17894

refs sysadmin#17946

refs tails#17699

It would only work if it were the first line of the file,
which we cannot do because the EPP parameter tag must come first.

This allows tails::weblate::staging_website to benefit from it,
and avoids having to modify ikiwiki.setup.epp.

It's the source of a File resource.

refs tails#17699, tails!756

refs tails#17699, tails!756