[gimp-web/oscp] Update Dockerfile to use official Centos Stream 8 container

[Jehan <jehanp src gnome org>]

commit 60f7669dd0f36b8adb7bf12418cec1dcd14bddbe
Author: Michael <misc zarb org>
Date:   Wed Feb 23 13:24:56 2022 +0000

    Update Dockerfile to use official Centos Stream 8 container

 testing.gimp.org/Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/testing.gimp.org/Dockerfile b/testing.gimp.org/Dockerfile
index c3774dec..bcf5f706 100644
--- a/testing.gimp.org/Dockerfile
+++ b/testing.gimp.org/Dockerfile
@@ -1,4 +1,4 @@
-FROM centos:8
+FROM quay.io/centos/centos:stream8
 RUN dnf install -y python3-pip git make
 
 ARG branch=testing