Add configuration to use extra arguments with dendrite command

Signed-off-by: Rhea Danzey <rdanzey@element.io>

helm/dendrite/templates/deployment.yaml

@@ -56,6 +56,9 @@ spec:
         args:
           - '--config'
           - '/etc/dendrite/dendrite.yaml'
+        {{- with .Values.extraArgs }}
+        {{- toYaml . | nindent 10 }}
+        {{- end }}
         ports:
           - name: http
             containerPort: 8008

helm/dendrite/values.yaml

@@ -77,6 +77,9 @@ persistence:
     #   GKE, AWS & OpenStack)
     storageClass:
 
+# -- Add additional arguments to the dendrite command
+extraArgs: []
+
 # -- Add additional volumes to the Dendrite Pod
 extraVolumes: []
 # ex.