adding ability to use an existing Secret for s3

k8s/charts/seaweedfs/templates/filer-statefulset.yaml

@@ -195,9 +195,11 @@ spec:
             - name: seaweedfs-filer-log-volume
               mountPath: "/logs/"
             {{- end }}
+            {{- if .Values.filer.s3.enableAuth }}
             - mountPath: /etc/sw
               name: config-users
               readOnly: true
+            {{- end }}
             {{- if (or .Values.filer.enablePVC (or (eq .Values.filer.data.type "hostPath") (eq .Values.filer.data.type "persistentVolumeClaim"))) }}
             - name: data-filer
               mountPath: /data
@@ -285,10 +287,16 @@ spec:
         - name: db-schema-config-volume
           configMap:
             name: seaweedfs-db-init-config
+        {{- if .Values.filer.s3.enableAuth }}
         - name: config-users
           secret:
             defaultMode: 420
+            {{- if .Values.filer.s3.existingConfigSecret }}
+            secretName: {{ .Values.s3.existingConfigSecret }}
+            {{- else }}
             secretName: seaweedfs-s3-secret
+            {{- end }}
+        {{- end }}
         {{- if .Values.global.enableSecurity }}
         - name: security-config
           configMap: