* Supply '--network slirp4netns:allow_host_loopback=true' argument when launching via Podman
This means that the host.containers.internal address will work as a way
to access the host machine's network from within the container in
Podman. This is eqivalent to '--add-host
host.docker.internal:host-gateway' in Docker.
* Log the locations of generated files for Cypress tests
* Use 'host.containers.internal' to access the host network when using Podman
* Support Podman in email Cypress tests too
* Restrict code that decides between Docker and Podman to run in Cypress plugins
Because it can't run in the browser - it needs to run a command line
command to find out.
* Move logic for HOST_DOCKER_INTERNAL into cfgDirFromTemplate
3d2d08b132