Support additional container software

[bcdarwin]

As of 2.0.17 Pydpiper has support for Singularity, but we should also support:

• Apptainer (trivial since the CLI is currently identical or nearly so)
• Docker
• Podman

We could also allow the user to specify arbitrary containerization commands (e.g. using templates as was done in 2.0.16 for shell commands) or alternately use Python libraries to interface with these programs.