Support custom Ingress path (#151)

Adds support for a custom Ingress path. This allows us to run Gitea as a path in an existing domain.

Co-authored-by: Matt Kaar <mkaar@cert.org>
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/151
Reviewed-by: luhahn <luhahn@noreply.gitea.io>
Reviewed-by: justusbunsi <justusbunsi@noreply.gitea.io>
Co-authored-by: mattkaar <mattkaar@noreply.gitea.io>
Co-committed-by: mattkaar <mattkaar@noreply.gitea.io>

values.yaml

@@ -54,7 +54,10 @@ ingress:
     # kubernetes.io/ingress.class: nginx
     # kubernetes.io/tls-acme: "true"
   hosts:
-    - git.example.com
+    - host: git.example.com
+      paths:
+        - path: /
+          pathType: Prefix
   tls: []
   #  - secretName: chart-example-tls
   #    hosts: