Support podman container

[ChemicalXandco]

Proposed change

This adds support for podman container runtime which does not create /.dockerenv (see containers/podman#648) so it does not detect the container.

I also changed the key to container as it is otherwise misleading.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes System info does not consider other container runtimes #73982

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

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[balloob]

This is a huge breaking change and I don’t see any benefit. What problem is this solving?

[bonzini]

I like being able to use podman because the docker daemon sometimes breaks, but I think you should keep the docker key even if it also works for podman.