Add pipdeptree to In-Dockerfile Dependency Generation

[ric-evans]

Also, don't install/use podman if it's not needed.

tested on WIPACrepo/SkyDriver#80 & icecube/skymap_scanner#226

[dsschult]

Interesting. Probably a useful tool.

I guess the question is, why only run it in the Dockerfile, and not on regular python libs?

[ric-evans]

Interesting. Probably a useful tool.

I guess the question is, why only run it in the Dockerfile, and not on regular python libs?

pip-compile already has a dependency tree, albeit not as detailed as this one. pip-compile also doesn't require the package to be installed. There is https://github.com/ddelange/pipgrip, which does not require installs. However, it's only in v0.10.7.