Fix issue with DOCKER_HOST and add limited Podman CI workflow

[cristianrgreco]

Observed Docker/Podman differences:

• Currently cannot Docker login with Podman (w/ GitLab Registry: "invalid status code from registry 404" containers/podman#16842), will be fixed by compat: /auth: parse server address correctly containers/podman#17581
• Podman login to Docker hub not working with our registry auth resolution. We require a full URI match (with or without protocol, e.g https://index.docker.io/v1/), but Podman stores just the host (index.docker.io), so we do not work with private registries in Docker hub.
• Inspecting a container's exposed ports returns an empty host IP. We cannot determine which host IP family to use (Inspecting a container's exposed ports returns an empty HostIp containers/podman#17780)
• Locally created images have registry set to localhost instead of empty (podman build tags images in the local registry with a leading localhost/ and docker does not containers/buildah#1034)
• Health checks must provide all 3 options, interval, retries and timeout, else it doesn’t run (Does not schedule healthcheck for images with HEALTHCHECK containers/podman#3525)
• “Address already in use” error when restarting a container: Container restart fails with "address already in use" containers/podman#9447. The available version in debian is 3.x, whereas the fix is in 4.x, therefore we must install Podman from Debian_Testing
• Index server address returned from "/info" endpoint is empty string, requires a default to https://index.docker.io/v1/ (GET /info not returning IndexServerAddress containers/podman#17776)
• Build image with pull policy differs. Value of pull must be boolean, whereas string is supported by Docker (Build image pull field type mismatch with Docker containers/podman#17778)
• Image pull event not emitted when building image from Dockerfile with pull set to true (Events: image pull event not emitted when building image from Dockerfile with pull set to true containers/podman#17779)

Observed Docker/Colima differences:

• IPv6 not supported IPv6 localhost not supported abiosoft/colima#583

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This PR will keep a basic podman workflow which runs the generic-container tests. It has already provided value in discovering an existing issue with the DOCKER_HOST environment variable, which this PR also fixes (fixes #487).

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