[gimp-web/oscp] [testing] use ARGs in Dockerfile

[Michael Schumacher <schumaml src gnome org>]

commit 15e8745919370b2bb84b49631e30e21da7386f64
Author: Michael Schumacher <schumaml gmx de>
Date:   Mon Jul 5 18:00:37 2021 +0200

    [testing] use ARGs in Dockerfile

 testing.gimp.org/Dockerfile | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/testing.gimp.org/Dockerfile b/testing.gimp.org/Dockerfile
index 38b08d7d..c3774dec 100644
--- a/testing.gimp.org/Dockerfile
+++ b/testing.gimp.org/Dockerfile
@@ -1,12 +1,15 @@
 FROM centos:8
 RUN dnf install -y python3-pip git make
 
-RUN git clone --depth 1 --branch testing https://gitlab.gnome.org/Infrastructure/gimp-web && \
+ARG branch=testing
+ARG target=testing
+
+RUN git clone --depth 1 --branch $branch https://gitlab.gnome.org/Infrastructure/gimp-web && \
     cd gimp-web && \
     python3 -m venv py3-venv && \
     source py3-venv/bin/activate && \
     pip3 install -r py3-requirements.txt && \
-    make testing
+    make $target
 
 FROM centos/httpd-24-centos7
 USER root