[extensions-web/vbump/django] openshift: Dockerfile: allow to override python image

[Yuri Konotopov <ykonotopov src gnome org>]

commit c3da6b69889d39906d62c2409a3be0449daba5eb
Author: Yuri Konotopov <ykonotopov gnome org>
Date:   Sat Jan 15 17:58:48 2022 +0400

    openshift: Dockerfile: allow to override python image

 openshift/docker/Dockerfile | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/openshift/docker/Dockerfile b/openshift/docker/Dockerfile
index d8117b4..59bc8f4 100644
--- a/openshift/docker/Dockerfile
+++ b/openshift/docker/Dockerfile
@@ -1,6 +1,7 @@
+ARG PYTHON_IMAGE=python
 ARG PYTHON_VERSION=3.9
 
-FROM python:$PYTHON_VERSION as xapian
+FROM $PYTHON_IMAGE:$PYTHON_VERSION as xapian
 
 ARG XAPIAN_VERSION=1.4.19
 ENV PYTHONUNBUFFERED=1
@@ -8,7 +9,7 @@ ENV PYTHONUNBUFFERED=1
 COPY openshift/docker/scripts/ /tmp/scripts/
 RUN /tmp/scripts/install-xapian.sh
 
-FROM python:$PYTHON_VERSION
+FROM $PYTHON_IMAGE:$PYTHON_VERSION
 
 LABEL author="Yuri Konotopov <ykonotopov gnome org>"