[common] Dont load fixed middlewares if not found or not enabling treafik integration by default

[PrivatePuffin]

Is your feature request related to a problem?

Currently I think we try-to load fixed-middleware, even if they are not found.
This means our ingress (without disabling the integration code), is inherently not compatible with upstream treafik, which makes it less easy for non-truecharts-centered users to use TrueCharts common in their clusters.

Describe the solution you'd like

Not loading fixed-middlewares if they are not found/present and the treafik namespace is not set.

Describe alternatives you've considered

Not enabling the integration by default.
Which is a serieus option we should consider for compatibility tbh.

Additional context

No response

I've read and agree with the following

• I've checked all open and closed issues and my request is not there.
• I've checked all open and closed pull requests and my request is not there.

[PrivatePuffin]

@stavros-k You wrote most of this, so I've assigned it to your for feedback and convenience.

[stavros-k]

traefik integration is:

1. enabled by default in the code
2. enabled by default for main ingress in common values

Fixed middlewares are:

1. enabled by default in the code
2. enabled by default in the global common values

if namespace is given, we use that, otherwise we try to lookup.
If we dont find the namespace we fail.

For this we can do either:

• if namespace key is missing and we don't find it with lookup, ignore that middleware. (if the key exists but its "" we fail)
• Same as above, but also add a "warning" in the NOTES.txt

tbh I don't like silently ignoring.
we could leave the logic as is but make the fixedMiddlewares opt-in or to have "less" impact, make the traefik integration opt-in?
This way users that dont want to use traefik won't ever see deal with any fixed middlewares

[PrivatePuffin]

@stavros-k I would say:

• Traefik integration disabled by default,
• Move fixed-middlewares to common
• Create them when enabled on each chart separately
• Fixed-middlewares enabled by default when traefik integration is enabled

It moves logic from traefik -> common and ensure we would never have to rely on cross-namespace lookups

[stavros-k]

Cool. I think first would be to make a class/spawner for middlewares.
Then do the rest of the changes

[PrivatePuffin]

Cool. I think first would be to make a class/spawner for middlewares. Then do the rest of the changes

correct

[stavros-k]

Cool. I think first would be to make a class/spawner for middlewares. Then do the rest of the changes

correct

#30529