Liveness and Readiness probes

[RealAnna]

for testing issues, it can be nice to remove readiness and liveness probes completely, but for production I would expect the possibility to customize them 100%

I tried a first solution appending helm ifs statements to the container spec by treating it as a string. This will of course make the container spec impossible to be cast back to corev1.Containers , but as long as this step is done right before the conversion to string of the metadata I see no problems with it...

we do not use startup probes, but maybe this approach could be extended

current implementation here #73