Instead of only testing the runner registration, which doesn't tell us
all that much, we now test a (very simple) but actual workflow directly
runner on the host (type `:host`).
For this to work, we cache the official `actions/checkout` action from
GitHub as FOD and essentially mirror one version of it to Forgejo as
part of the test.
Since Forgejo does not yet provide an API endpoint for the workflow status
(whether a workflow is running, failed or successful), we have to resort
to parsing html for now.
It has some rather over the top poll logic, but I feel like will work
for quite some time without issues going unnoticed or whatever (TM).
This is essentially a response to a bug I found in
`services.gitea-actions-runner`, because we had no way to test that
module besides the runner registration (which, again, doesn't really
tell us all that much).
We inherited almost all of this test from `nixos/tests/gitea` when we
decided to split.
This change saves some resources (just 2 instead of 3 VMs) and is (IMHO)
easier to follow and improve upon.
We forgot to set two version related ldflags in our packaging and this
should prevent this from going unnoticed again.
Further details are in dab7aa20ed.
This should allow us to catch issues regarding that in the future.
nixos/gitea had an issue with the dump service recently, which didn't
affect us, fortunately.
But to be fair, it only affected non-default-y setups.
Not something we are able to catch in the current, rather simple, config
of our test.
Still, I see a lot of value adding this new subtest to our test suite.
Anyhow, this patch also exposes the resulting tarball as test (build)
output, which is a nice addition IMHO, as it allows some sort of
external sanity-check, if needed, without running the test interactive.
