Allow our Docker Compose set up to work with Podman

[anthonyfok]

It would be nice to get our current Docker Compose set up to work with Podman, especially with "Rootless Podman" for best security.

Issues to resolve include:

• Rootless Podman does not allow port number < 1024. Workaround like sudo sysctl net.ipv4.ip_unprivileged_port_start=80 exists, but if we could get WordPress to run at other ports and still be able to run everything normally, that would be ideal.

• UID/GID mismatch, e.g. 1000 vs 1000999, when I tried some time ago. But perhaps --userns=keep-id is the solution? See:

  • Understanding rootless Podman's user namespace modes | Enable Sysadmin
  • Does podman-compose have a way to pass the "--userns keep-id" argument? · Issue #166 · containers/podman-compose

See Shortcomings of Rootless Podman at https://github.com/containers/podman/blob/main/rootless.md for more details.