Update after rebase

After the rebase several updates were needed to allow Flatpak applications to be build:

• Adapt the way of enabling binfmt according to the relase
• Update tests to use v2025 as default release
• Support passing OSTREE_PUSH_SERVER_CONFIG to tests

apertis-issues#843 (closed)

Signed-off-by: Walter Lozano walter.lozano@collabora.com