CI: run integration tests with slirp4netns
Fix #50 (closed)
The tests take about 3 minutes: https://gitlab.freedesktop.org/AkihiroSuda/libslirp/-/jobs/15565416
Fix #50 (closed)
The tests take about 3 minutes: https://gitlab.freedesktop.org/AkihiroSuda/libslirp/-/jobs/15565416