cmd/run: Adjust for changes in 'podman ps' in Podman 2.0

[debarshiray]

The key containing the container's name (ie., "Names") is no longer a
string, but a slice of strings.

[debarshiray]

I wish we had tests for the enter command, but I guess it's hard to drive it non-interactively as part of a test-suite. This code path is part of the fallback we have when there's only one toolbox container, but it's not the default, and toolbox enter shows a message and continues to use it without requiring any arguments.

I am also looking forward to #503 which will make the JSON parsing a lot nicer. :)

[softwarefactory-project-zuul]

Build failed.

• shellcheck : SUCCESS in 2m 30s
• system-test-fedora-31 : SUCCESS in 3m 56s
• system-test-fedora-32 : SUCCESS in 3m 51s
• system-test-fedora-rawhide : FAILURE in 4m 42s

[HarryMichal]

I wish we had tests for the enter command, but I guess it's hard to drive it non-interactively as part of a test-suite. This code path is part of the fallback we have when there's only one toolbox container, but it's not the default, and toolbox enter shows a message and continues to use it without requiring any arguments.

It is possible to do it even if it is not interactive. I slimmed the CI considerably in #375 mainly due to problems with pulling images that caused the CI to flake a lot (#372). Currently, bats does not clean between test cases to save bandwidth and time. We could break that pattern and make the tests more complicated.