Allow chart user to add extra ingress paths

This supports adding paths to the oncall host so the ingress can be
configured to work with annotation-based ingress controllers (for
example, the ALB ingress controller).

By default no extra paths are added, and this change should be backwards
compatible.

helm/oncall/templates/ingress-regular.yaml

@@ -31,6 +31,9 @@ spec:
   - host: {{ .Values.base_url | quote }}
     http:
       paths:
+{{- if .Values.ingress.extraPaths }}
+{{ toYaml .Values.ingress.extraPaths | indent 6}}
+{{- end }}
       - path: /
         pathType: Prefix
         backend:

helm/oncall/values.yaml

@@ -58,6 +58,21 @@ ingress:
     - hosts:
         - "{{ .Values.base_url }}"
       secretName: certificate-tls
+  # Extra paths to prepend to the host configuration. If using something 
+  # like an ALB ingress controller, you may want to configure SSL redirects 
+  extraPaths: []
+  # - path: /*
+  #   backend:
+  #     serviceName: ssl-redirect
+  #     servicePort: use-annotation
+  ## Or for k8s > 1.19
+  # - path: /*
+  #   pathType: Prefix
+  #   backend:
+  #     service:
+  #       name: ssl-redirect
+  #       port:
+  #         name: use-annotation
 
 # Whether to install ingress controller
 ingress-nginx: