FR: Expand #7991 to not just append blindly

[samip5]

Is your feature request related to a problem? Please describe.
I'm frustrated when I tried to include new cri options, but instead it results in duplicate entries.

Describe the solution you'd like
I would like it to be smarter when appending, so that it would merge the values together if otherwise would result in duplicates.

Describe alternatives you've considered
N/A

Additional context
Related to: #7991

I tried to configure cri with:

[plugins."io.containerd.grpc.v1.cri"]
device_ownership_from_security_context = true

but that results in duplicates with the existing cri definition.

[brandond]

That is not how golang templates work. Doing what you are asking would require adding support for parsing, merging, and re-marshaling the TOML config files, and we do not have plans to do so.

If using {{ template "base" . }} does not work for you because you need to modify one of the existing sections, then you should provide a full template.

[samip5]

Doing what you are asking would require adding support for parsing, merging, and re-marshaling the TOML config files, and we do not have plans to do so.

Why not though? Due to maintenance burden or something related?
I'm not trying to be a pain, but I just want to understand the reason.

[brandond]

Because we already have a way to accomplish your goal of customizing the containerd config, in a way that does not require us to develop, maintain, and test additional code that mangles the TOML.