Add ssh env variables to tox testenv

[inknos]

For users who have a ssh key protected by passphrase tests can hang and fail on 'Enter passphrase for key' if the correct ssh agent env variable is not set in tox.

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[inknos]

/packit build

[jwhonce]

@inknos It looks like your change impacted how ssh connectiions are being parsed. Or did the podman API server change?

[inknos]

no, there must be something wrong. I'll close the PR for now and try to look more in my local env. This looks like being a fix for me only :/