* Bump github.com/docker/docker to latest release
* Pin deps to docker/docker's requirements
fix build breakages
fix unit test
Trying to see whether am-i-in-a-container checks are broken for integration tests...
The upstream of github.com/genuinetools/amicontained switched to the
container runtime detection via github.com/genuinetools/bpfd/proc,
which supports a larger range of container runtimes. With this change
(among others) Podman can be detected correctly.
Fixes#1501.