helmchart: hostAliases support (#720)

Signed-off-by: tombokombo <tombo@sysart.tech>

chart/jenkins-operator/templates/jenkins.yaml

@@ -105,6 +105,9 @@ spec:
     priorityClassName: {{ .Values.jenkins.priorityClassName }}
     {{- end }}
     disableCSRFProtection: {{ .Values.jenkins.disableCSRFProtection }}
+    {{- with .Values.jenkins.hostAliases }}
+    hostAliases: {{ toYaml . | nindent 4 }}
+    {{- end }}
     containers:
       - name:  jenkins-master
         image: {{ .Values.jenkins.image }}

chart/jenkins-operator/values.yaml

@@ -47,6 +47,17 @@ jenkins:
   # See https://github.com/jenkinsci/kubernetes-operator/pull/193 for more info
   disableCSRFProtection: false
 
+  # adding entries to a pod's /etc/hosts file provides pod-level override of hostname
+  # resolution when DNS and other options are not applicable.
+  hostAliases: {}
+  # - ip: "127.0.0.1"
+  #   hostnames:
+  #   - "foo.local"
+  #   - "bar.local"
+  # - ip: "10.1.2.3"
+  #   hostnames:
+  #   - "foo.remote"
+  #   - "bar.remote"
 
   # validateSecurityWarnings enables or disables validating potential security warnings in Jenkins plugins via admission webhooks.
   validateSecurityWarnings: false