feat: add multi-issuer support based on host header

[sylr]

Dynamically select the OIDC issuer from the incoming X-Forwarded-Host (or Host) header, validated against a configured list of trusted issuers. This allows the auth service to serve multiple domains with correct issuer URLs in discovery and token endpoints.

Adds --auth-issuers flag for specifying additional trusted issuer URLs.

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📥 Commits

Reviewing files that changed from the base of the PR and between 2ba6855 and 3c16e43.

📒 Files selected for processing (7)

• cmd/serve.go
• pkg/api/module.go
• pkg/oidc/grant_type_bearer.go
• pkg/oidc/issuer.go
• pkg/oidc/module.go
• pkg/oidc/oidc_test.go
• pkg/oidc/provider.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/multi-issuers

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