nixos/tests/forgejo: test Forgejo Runner registration and workflow

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).

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