[odrs-web/oscp] Make use of scl_source

[Andrea Veri <averi src gnome org>]

commit 9f40070eb55e0a713d2905b50d423796fe3377c9
Author: Andrea Veri <averi redhat com>
Date:   Tue Nov 13 09:55:37 2018 +0100

    Make use of scl_source

 Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/Dockerfile b/Dockerfile
index fde0403..84d1474 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,7 +13,7 @@ WORKDIR ${ODRS_HOME}
 COPY app_data ${ODRS_HOME}
 
 COPY requirements.txt .
-RUN /bin/bash -c "source /opt/rh/rh-python36/enable" && pip install -r requirements.txt
+RUN source scl_source enable rh-python36 && pip install -r requirements.txt
 
 COPY odrs.gnome.org.conf /etc/httpd/conf.d/000-default.conf