feat(helm): allow cluster administrator to configure ingress host (#804)

Closes reanahub/reana-workflow-controller#587

Author: Alputer

AUTHORS.md

@@ -8,6 +8,7 @@ organisation on GitHub, in alphabetical order:
 - [Adelina Lintuluoto](https://orcid.org/0000-0002-0726-1452)
 - [Agisilaos Kounelis](https://orcid.org/0000-0001-9312-3189)
 - [Alizee Pace](https://www.linkedin.com/in/aliz%C3%A9e-pace-516b4314b/)
+- [Alp Tuna](https://orcid.org/0009-0001-1915-3993)
 - [Ana Trisovic](https://orcid.org/0000-0003-1991-0533)
 - [Anton Khodak](https://orcid.org/0000-0003-3263-4553)
 - [Audrius Mecionis](https://orcid.org/0000-0002-3759-1663)

helm/reana/templates/reana-workflow-controller.yaml

@@ -86,6 +86,8 @@ spec:
             value: {{ .Values.namespace_runtime | default .Release.Namespace }}
           - name: REANA_INGRESS_ANNOTATIONS
             value: {{ .Values.ingress.annotations | toJson | quote }}
+          - name: REANA_INGRESS_HOST
+            value: {{ .Values.reana_hostname | default "" | quote  }}
           - name: REANA_DEFAULT_QUOTA_CPU_LIMIT
             value: {{ .Values.quota.default_cpu_limit | default 0 | quote }}
           - name: REANA_DEFAULT_QUOTA_DISK_LIMIT