feat: add extra volume and volumeMounts spec to Dex

[miinsun]

What type of PR is this?
/kind enhancement

What does this PR do / why we need it:
This PR includes the following fields in the DexSpec type:

• .spec.sso.dex.volumes
• .spec.sso.dex.volumeMounts

This ensures that Dex deployment can properly handle volumes and volume mounts.

Have you updated the necessary documentation?

• Documentation update is required by this PR.
• Documentation has been updated.

Which issue(s) this PR fixes:

Fixes #1597

How to test changes / Special notes to the reviewer:

[svghadi]

Hi @miinsun , thanks for the PR. Can you run make generate manifests bundle to fix the codegen CI check?

[miinsun]

Hi @svghadi , sure! I ran make generate manifests bundle and pushed the updated files.

Just a quick note — on macOS, the sed -i command in the Makefile was causing an error due to the sed syntax. I was able to fix it by changing:

❌ sed -i 's/control-plane: argocd-operator/control-plane: ...   

✅ sed -i '' 's/control-plane: argocd-operator/control-plane: ... 

[miinsun]

Hi @svghadi,

I’m encountering some SSO configuration errors in my E2E runs:

2025-05-10T04:27:38Z ERROR controller_argocd  
  Failed to update existing SSO Configuration for ArgoCD “argocd”  
  in namespace kuttl-test-guiding-lacewing  
  {"error":"illegal SSO configuration: cannot supply dex configuration when requested SSO provider is keycloak"}

2025-05-10T04:32:49Z ERROR controller_argocd  
  Failed to update existing SSO Configuration for ArgoCD “argocd”  
  in namespace test-1-042-restricted-pss-compliant  
  {"error":"illegal SSO configuration: must supply valid dex configuration when requested SSO provider is dex"}

I originally assumed that simply adding the following fields would be sufficient:

• spec.sso.dex.volumes
• spec.sso.dex.volumeMounts

However, the E2E failures suggest there’s more to it.

Do we need to update the ArgoCD SSOConfig CRD (or controller logic) to properly handle these new Dex volumes and volumeMounts fields? Any guidance or a reference fixture/example would be greatly appreciated!

Thanks 😊