[wgo-web/nginx] Switch to centos:7 hosted on quay

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit 5eada95f008d1b22de43730289afb21121724c71
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Sun Nov 22 16:33:54 2020 +0100

    Switch to centos:7 hosted on quay

 memberslist/Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/memberslist/Dockerfile b/memberslist/Dockerfile
index a9c01fe..a1afd42 100644
--- a/memberslist/Dockerfile
+++ b/memberslist/Dockerfile
@@ -1,4 +1,4 @@
-FROM centos:7
+FROM quay.io/app-sre/centos:7
 ADD ipa-ca.crt /etc/ipa/ca.crt
 RUN yum install -y git python-ldap && \
     install -d /home/admin &&