fix(chart): ingress template nil pointer when backend is omitted

[milesibastos]

Bug

charts/evolution/templates/ingress.yaml line 53 fails with nil pointer when backend is omitted from ingress.hosts[].paths[]:

template: evolution/templates/ingress.yaml:53:51: executing "evolution/templates/ingress.yaml" at <.backend.service.name>: nil pointer evaluating interface {}.service

Root cause

Line 53 uses {{ default $fullName .backend.service.name }} — when .backend is nil, accessing .service on nil panics. The default function doesn't short-circuit nil traversal.

# Line 53
name: {{ default $fullName .backend.service.name }}

Expected behavior

Omitting backend from paths should use the chart's default service name ($fullName) and port ($svcPort), as the default function suggests.

Workaround

Explicitly set backend in values:

ingress:
  hosts:
    - host: example.com
      paths:
        - path: /
          pathType: ImplementationSpecific
          backend:
            service:
              name: evolution
              port:
                number: 8080

Fix

Replace direct traversal with nil-safe access:

# Before
name: {{ default $fullName .backend.service.name }}
port:
  number: {{ default (int $svcPort) (int .backend.service.port.number) }}

# After
name: {{ default $fullName (dig "backend" "service" "name" "" .) }}
port:
  number: {{ default (int $svcPort) (dig "backend" "service" "port" "number" 0 . | int) }}

Or wrap in a conditional:

{{- if .backend }}
name: {{ default $fullName .backend.service.name }}
port:
  number: {{ default (int $svcPort) (int .backend.service.port.number) }}
{{- else }}
name: {{ $fullName }}
port:
  number: {{ $svcPort }}
{{- end }}