Add option to set envs in BuildMixin.build function

[jabrcks]

I am creating this as an issue/enhancement as I did not see an option for this elsewhere. It would be nice to have a possibility to set environment variables during the image building and/or reference an env file. Talking about this build function here: https://podman-py.readthedocs.io/en/latest/podman.domain.images_manager.html#podman.domain.images_manager.ImagesManager.build
Afaik podman itself provides the option to set envs in the image build process while podman python only allows buildargs which are not getting passed to the image itself.

Thanks!

[inknos]

@jabrcks sorry, late to the party.

I want to share a little investigation that I did before moving on.

Basically, you want to be able to do this:

podman build -t test-image --env=TEST=testenv -<< EOF
FROM fedora:latest
RUN :
EOF

Which is equivalent to doing this:

podman build -t test-image -<< EOF
FROM fedora:latest
ENV TEST=testenv
RUN :
EOF

The resulting API call for what you want would be /v5.7.0/libpod/build? ... &setenv=TEST=testenv& ... &t=test-image

As far as I understand it, Podman adds setenv and appends what gets in from podman build --env, but that's not an API endpoint.

@mheon, I am not confident to know well that part of codebase, am I getting it right?

If so, I think the fix is fairly easy. We would only need to pass the env options to the endpoint.