quadlet: handle generate environment params that inherit from host

[NotSoFancyName]

Fixes: #26247

Does this PR introduce a user-facing change?

This fix allows the user to use Podman's default logic for propagating environment variables from the host to the container in the Quadlet generator

[openshift-ci]

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[packit-as-a-service]

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[baude]

we ask for tests on most of our PRs; the CI is blocking because it did not find a test included. I think this is something you probably should add a test for to protect against regressions.

[ygalblum]

Thanks for the PR.
The problem with this change is that it works for --env and --label but does not work for others, e.g. --annotations which cannot be defined without a value.
Having said that, Quadlet does not validate inputs in other cases, so maybe it shouldn't do it here either. @Luap99 WDYT?

[Luap99]

Thanks for the PR. The problem with this change is that it works for --env and --label but does not work for others, e.g. --annotations which cannot be defined without a value. Having said that, Quadlet does not validate inputs in other cases, so maybe it shouldn't do it here either. @Luap99 WDYT?

Yeah right that is a good point. I think in general we should avoid input validation in quadlet as much as possible to avoid these kind of bugs so I am in favour of dropping these checks. If the input is invalid podman will still error.

[Luap99]

Please squash the commits into one. As we want fixes and tests in the same commit.

code change itself LGTM