This is intended to reduce the amount of traffic we generate to
flathub, particularly so we can run this test on updates as well
as composes. We have to set a proxy and trust an SSL cert.
Signed-off-by: Adam Williamson <awilliam@redhat.com>
This PR tries to respond to issue #294.
On Silverblue, this will try:
* flatpak install
* flatpak remote-add
* flatpak list
* flatpak remotes
* flatpak remove
* flatpak update
and also it tests that a flatpak can be built.