For ease of running the entire tests locally
```
cd contrib
docker build -t containerd-test -f Dockerfile.test --target integration ..
docker run --privileged containerd-test
docker build -t containerd-test -f Dockerfile.test --target cri-integration ..
docker run --privileged --sysctl net.ipv6.conf.all.disable_ipv6=0 containerd-test
docker build -t containerd-test -f Dockerfile.test --target critest ..
docker run --privileged --sysctl net.ipv6.conf.all.disable_ipv6=0 containerd-test
```
Tested on Ubuntu 22.10 (amd64, cgroup v2).
Known issues:
- cri-integration and critest: require `--sysctl net.ipv6.conf.all.disable_ipv6=0` to avoid
errors like `failed to set bridge addr: could not add IP address to "cni0": permission denied`
- critest: Often fails due to Docker Hub rate limits. Fix is coming in kubernetes-sigs/cri-tools PR 1053
Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
