fix: Implement custom schema for config.affinity.nodeSelector

[sbernauer]

Description

Fixes stackabletech/issues#554.

IMHO it's not worth an immediate platform bugfix release, as there is a workaround available.

The effect can be seen e.g. in Trino:

diff --git a/deploy/helm/trino-operator/crds/crds.yaml b/deploy/helm/trino-operator/crds/crds.yaml
index e41fdfb..5de8694 100644
--- a/deploy/helm/trino-operator/crds/crds.yaml
+++ b/deploy/helm/trino-operator/crds/crds.yaml
@@ -305,6 +305,8 @@ spec:
                                   type: object
                               type: object
                             nodeSelector:
+                              additionalProperties:
+                                type: string
                               nullable: true
                               type: object
                             podAffinity:
@@ -647,6 +649,8 @@ spec:
                                     type: object
                                   type: array
                               type: object
+                          required:
+                            - nodeSelector
                           type: object

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1. Changes are OpenShift compatible
2. CRD changes approved
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1. Code contains useful comments
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[Techassi]

IMHO it's not worth an immediate bugfix release, as there is a workaround available.

I would be happy to release a new version, because there are now multiple things which are unreleased.

[Techassi]

I would however do one additional PR regarding the changelog before bumping the version.

[sbernauer]

I already changed the wording the "bugfix platform version", sorry for the confusion. No objections against op-rs release whatsoever

[nightkr]

I tried diffing the output before/after this patch: https://gist.github.com/nightkr/9446c9e3747aa6f58ce616cd86c1f13e

As far as I can tell, the actual issue here is that schemars doesn't propagate additionalProperties when used with #[serde(flatten)]? We should probably file an upstream ticket for that and link to it in the code.

[nightkr]

This looks like GREsau/schemars#259.

[nightkr]

GREsau/schemars#275 generates the schema https://gist.github.com/nightkr/f7f06df7a14286a9b682ad6be7e3da14, which should also contain the correct additionalProperties.

[nightkr]

Another workaround is to add #[schemars(deny_unknown_fields)] to StackableNodeSelector: https://gist.github.com/nightkr/af2236b2d3cf77eb71242124d588a638

[sbernauer]

Many thanks for tracking this down @nightkr! What would you suggest as the next step?

1. Merge as is
2. Use #[schemars(deny_unknown_fields)]
3. Wait for a few days to see if Propagate additional_properties when using #[serde(flatten)] GREsau/schemars#275 get's merged
4. Something else

[nightkr]

@sbernauer I'd say 2 and add a tracking issue for 3. schemars doesn't look too lively these days so we shouldn't block on it.

[sbernauer]

Makes sense to me! Adopted Option 2 and created #756.
A quick review would be great, so that @Techassi can release :)

[NickLarsenNZ]

I trust that this works, and as I understand it we simple remove the [schemars(deny_unknown_fields)] as soon as that schemars issue is resolved.