docker-ce: update to 20.10.6

Updating docker-ce to 20.10.6, we also restructure the recipe to build
as mentioned in: https://github.com/docker/docker-ce

This now makes the docker-ce recipe virtually identical to the moby
variant, with only SRCREV differences being signficant. The docker-ce
recipe will build the tags as identified by the docker-packaging
repository.

We keep this as a separate recipe for this update, so we can backport
the 20.10.6 change to older branches (for CVEs, etc), but the moby
and docker-ce recipes will (re)unify in following updates.

  root@qemux86-64:~# docker --version
  Docker version 20.10.6-ce, build 370c28948e
  root@qemux86-64:~# docker pull alpine
  Using default tag: latest
  latest: Pulling from library/alpine
  540db60ca938: Pull complete
  Digest:
  sha256:69e70a79f2d41ab5d637de98c1e0b055206ba40a8145e7bddb55ccc04e13cf8f
  Status: Downloaded newer image for alpine:latest
  docker.io/library/alpine:latest
  root@qemux86-64:~# docker run -it alpine /bin/sh
  [ 4099.428945] docker0: port 1(veth33cc29a) entered blocking state
  [ 4099.430548] docker0: port 1(veth33cc29a) entered disabled state
  [ 4099.434641] device veth33cc29a entered promiscuous mode
  [ 4100.219415] cgroup: cgroup: disabling cgroup2 socket matching due to net_prio or net_cls activation
  [ 4100.739037] eth0: renamed from vethe948f63
  [ 4100.746450] IPv6: ADDRCONF(NETDEV_CHANGE): veth33cc29a: link becomes ready
  [ 4100.748508] docker0: port 1(veth33cc29a) entered blocking state
  [ 4100.750150] docker0: port 1(veth33cc29a) entered forwarding state
  [ 4100.754370] IPv6: ADDRCONF(NETDEV_CHANGE): docker0: link becomes ready
  / # cat /etc/issue
  Welcome to Alpine Linux 3.13
  Kernel \r on an \m (\l)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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