quadlet: Support healthy for Notify directives

[deuill]

This expands support for the (previously) boolean Notify directive, in support of healthcheck determined SD-NOTIFY event emission, as supported by Podman with the --sdnotify=healthy option.

Fixes: #18189

Support `healthy` for `Notify` directives in Quadlet

[ygalblum]

The golinter doesn't like the way you've implemented the three cases.

[deuill]

The golinter doesn't like the way you've implemented the three cases.

Hmmm it seems to want this to be a switch, oh well. I was hoping to have CI pass on first go, but alas, I'll run tests locally before pushing again!

[mheon]

LGTM with the linter-suggested switch-case conversion

[deuill]

Hmmm, strange error out of localsystem tests:

[+0742s] # [12:55:03.052781581] # /var/tmp/go/src/github.com/containers/podman/bin/podman exec -t test sh -c echo -n $TERM
[+0742s] # /usr/lib/bats-core/test_functions.bash: line 383: warning: command substitution: ignored null byte in input
[+0742s] # [12:55:03.188913483] Error: container create failed (no logs from conmon): conmon bytes "": readObjectStart: expect { or n, but found , error found in #0 byte of ...||..., bigger context ...||...
[+0742s] # [12:55:03.197253125] [ rc=255 (** EXPECTED 0 **) ]
[+0742s] # #/vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
[+0742s] # #| FAIL: exit code is 255; expected 0
[+0742s] # #\^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[+0742s] # # [teardown]

Not sure if this is a flaky test, or perhaps something unexpected changed here?

[ygalblum]

Since the same test ran successfully on the other platforms, I assume it's a flake. But, @edsantiago can you PTAL?

[edsantiago]

Flake is #10927, one of our oldest and most annoying flakes. I've restarted the failed job.

[rhatdan]

/approve
/lgtm
Thanks @deuill

[openshift-ci]

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[deuill]

Thanks so much for fixing tests and for the quick turnaround here!