Usernetes

Build log: https://github.com/rootless-containers/usernetes/runs/979873794

Notable changes:
* Finally, CPU and memory resource limitations are supported on cgroup v2 hosts with systemd. (174)
Run `install.sh --cri=containerd --cgroup-manager=systemd` to install.
Tested on Ubuntu 20.04 and Fedora 32.
Currently CRI-O still does not support resource limitation.

* The default RootlessKit/slirp4netns CIDR is changed from `10.0.2.0/24` to `10.0.42.0/24` to avoid conflict with VirtualBox. (175)

Build log: https://github.com/rootless-containers/usernetes/runs/826181098

Notable changes:
* Added CoreDNS (170). Run `kubectl apply -f manifests/*.yaml` to install.

Build log: https://github.com/rootless-containers/usernetes/runs/761193767

Notable changes:
* Enable TLS (163)

Build log: https://github.com/rootless-containers/usernetes/runs/760580397

Notable changes:
* Preliminary support for cgroup v2 hosts. The runtimes are still using "none" cgroup driver. Resource limitation is not functional.

SHA256SUM:

f0c1d660ccc1a3367984b1b7bcf502fc72de44c24f489365223829fc6abd93d9 usernetes-x86_64.tbz

https://github.com/rootless-containers/usernetes/runs/494705529?check_suite_focus=true#step:4:4

Notable changes since [v20200304.0](https://github.com/rootless-containers/usernetes/releases/tag/v20200304.0):
* Fixed the release script

Notable changes since [v20200126.0](https://github.com/rootless-containers/usernetes/releases/tag/v20200126.0):
* Docker is no longer bundled with Usernetes (126), because the Docker upstream has been supporting Rootless mode since v19.03. To install Rootless Docker, see https://get.docker.com/rootless . See also https://docs.docker.com/engine/security/rootless/ for the further information.
* Migrated from go-task into systemd (133).
* Migrated from runc into crun for the ease of the future support of cgroup v2 (128).
* Migrated from native/vfs into fuse-overlayfs (138). Requires kernel >= 4.18.

SHA256SUM:

105ac67396c7737062e6bef7fa297ab53e0cc203e1d2fd9028f4a2f560cd644a usernetes-x86_64.tbz

https://github.com/rootless-containers/usernetes/runs/488489766?check_suite_focus=true#step:4:4