Fix pg_is ready user

kubernetes/templates/deployment.yaml

@@ -29,7 +29,7 @@ spec:
           args:
           - /bin/sh
           - -c
-          - until pg_isready -h {{ .Values.config.db.host }} -p {{ .Values.config.db.port }} -U {{ .Values.config.db.port }}; do echo waiting for database; sleep 2; done;
+          - until pg_isready -h {{ .Values.config.db.host }} -p {{ .Values.config.db.port }} -U {{ .Values.config.db.user }}; do echo waiting for database; sleep 2; done;
       containers:
       - name: {{ .Chart.Name }}
         image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"