feat(argo-workflows): Disable leader election on single repl controllers (#2565)

Signed-off-by: Tim Collins <tim@thecollins.team>
Co-authored-by: Aikawa <yu.croco@gmail.com>

charts/argo-workflows/templates/controller/workflow-controller-deployment.yaml

@@ -89,6 +89,10 @@ spec:
                 fieldRef:
                   apiVersion: v1
                   fieldPath: metadata.name
+          {{- if eq (int .Values.controller.replicas) 1 }}
+            - name: LEADER_ELECTION_DISABLE
+              value: "true"
+          {{- end }}
           {{- with .Values.controller.extraEnv }}
             {{- toYaml . | nindent 12 }}
           {{- end }}