Allow configuring Ingress rules

[Sgitario]

These changes also ensures that not duplicated ingress rules are generated.

Adding Ingress rules

To customize the default host and path properties of the generated Ingress resources, you need to apply the following configuration:

quarkus.kubernetes.ingress.expose=true
# To change the Ingress host. By default, it's empty.
quarkus.kubernetes.ingress.host=prod.svc.url
# To change the Ingress path of the generated Ingress rule. By default, it's "/".
quarkus.kubernetes.ports.http.path=/prod

This would generate the following Ingress resource:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  labels:
    app.kubernetes.io/name: kubernetes-with-ingress
    app.kubernetes.io/version: 0.1-SNAPSHOT
  name: kubernetes-with-ingress
spec:
  rules:
    - host: prod.svc.url
      http:
        paths:
          - backend:
              service:
                name: kubernetes-with-ingress
                port:
                  name: http
            path: /prod
            pathType: Prefix

Additionally, you can also add new Ingress rules by adding the following configuration:

# Example to add a new rule
quarkus.kubernetes.ingress.rules.1.host=dev.svc.url
quarkus.kubernetes.ingress.rules.1.path=/dev
quarkus.kubernetes.ingress.rules.1.path-type=ImplementationSpecific
# by default, path type is Prefix

# Exmple to add a new rule that use another service binding
quarkus.kubernetes.ingress.rules.2.host=alt.svc.url
quarkus.kubernetes.ingress.rules.2.path=/ea
quarkus.kubernetes.ingress.rules.2.service-name=updated-service
quarkus.kubernetes.ingress.rules.2.service-port-name=tcpurl

This would generate the following Ingress resource:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  labels:
    app.kubernetes.io/name: kubernetes-with-ingress
    app.kubernetes.io/version: 0.1-SNAPSHOT
  name: kubernetes-with-ingress
spec:
  rules:
    - host: prod.svc.url
      http:
        paths:
          - backend:
              service:
                name: kubernetes-with-ingress
                port:
                  name: http
            path: /prod
            pathType: Prefix
    - host: dev.svc.url
      http:
        paths:
          - backend:
              service:
                name: kubernetes-with-ingress
                port:
                  name: http
            path: /dev
            pathType: ImplementationSpecific
    - host: alt.svc.url
      http:
        paths:
          - backend:
              service:
                name: updated-service
                port:
                  name: tcpurl
            path: /ea
            pathType: Prefix

Fix #28812 Fix #26747

[Sgitario]

cc @ThoSap @geoand
@gsmet this pull request fixes the regression issue: #28812

[geoand]

@iocanel can you review this?

Thanks

[iocanel]

LGTM

[gsmet]

@Sgitario I tried to backport this one to 2.13 but I get:

[ERROR] /data/home/gsmet/git/quarkus/extensions/kubernetes/vanilla/deployment/src/main/java/io/quarkus/kubernetes/deployment/ChangeIngressRuleDecorator.java:[5,37] cannot find symbol
[ERROR]   symbol:   class IngressRule
[ERROR]   location: package io.dekorate.kubernetes.config

so my guess is that the Dekorate version we have in 2.13 doesn't support this.

I put the backport label back for now, please remove it if this is confirmed.

[Sgitario]

Indeed, this is only for 2.14 as it depends on the latest Dekorate version.