secret-file-collection: force little-endian in GVariant

As the GVariant serialization format does not record the original
endianness of integer values, we need to ensure that it doesn't change
between write and load.
6 jobs for wip/dueno/gvariant-endianness in 9 minutes and 23 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #625423
fedora:asan

00:09:00

passed #625425
fedora:coverage

00:05:59

69.8%
passed #625424
fedora:ubsan

00:02:52

passed #625422
fedora:Werror

00:08:34

 
  Deploy
passed #625426
pages

00:00:22

passed pages:deploy

00:00:04