podman: use connection instead of CONTAINER_HOST

[afbjorklund]

Sync the podman example, with the docker example.

Copy the example changes that were sneaked into:

• start.ShowMessage: remove the logrus INFO header, for ease of copypasting #595

commit 1e45f78

Note: using the environment variables still works just fine, so they are left in the comments.

Also using the new podman example, instead of running a docker example which was confusing.

https://en.wikipedia.org/wiki/Let%27s_Call_the_Whole_Thing_Off

🎶 "You like crun, I like runc. You say buildah, I say builder. ..."

---

Docker

To run `docker` on the host (assumes docker-cli is installed), run the following commands:
------
docker context create lima --docker "host=unix:///home/anders/.lima/docker/sock/docker.sock"
docker context use lima
docker run hello-world
------

$ docker context list
NAME      DESCRIPTION                               DOCKER ENDPOINT                                     KUBERNETES ENDPOINT   ORCHESTRATOR
default   Current DOCKER_HOST based configuration   unix:///var/run/docker.sock                                               swarm
lima *                                              unix:///home/anders/.lima/docker/sock/docker.sock                         

Podman

To run `podman` on the host (assumes podman-remote is installed), run the following commands:
------
podman system connection add lima "unix:///home/anders/.lima/podman/sock/podman.sock"
podman system connection default lima
podman --remote run quay.io/podman/hello
------

$ podman system connection list
Name                         Identity                                  URI
lima*                                                                  unix:///home/anders/.lima/podman/sock/podman.sock
podman-machine-default       /home/anders/.ssh/podman-machine-default  ssh://core@localhost:45615/run/user/1000/podman/podman.sock
podman-machine-default-root  /home/anders/.ssh/podman-machine-default  ssh://root@localhost:45615/run/podman/podman.sock

[afbjorklund]

PS. You might want to use the fully qualified name, also for docker.io ?

Status: Image is up to date for hello-world:latest
docker.io/library/hello-world:latest

https://www.redhat.com/en/blog/be-careful-when-pulling-images-short-name

I used the full name for podman, since some don't have quay.io set up.

Error: short-name "podman/hello" did not resolve to an alias and no unqualified-search registries are defined in "/etc/containers/registries.conf"

Resolved "hello-world" as an alias (/etc/containers/registries.conf.d/shortnames.conf)
Trying to pull docker.io/library/hello-world:latest...