[download-web] Add workaround for adsrc removal in PostgreSQL 12

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit 5f54e3204f46779fe1ca22bb1286f78478f27c34
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Wed Mar 4 12:04:22 2020 +0100

    Add workaround for adsrc removal in PostgreSQL 12

 Dockerfile | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/Dockerfile b/Dockerfile
index dcc5b21..260ca92 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -25,6 +25,9 @@ ADD download.gnome.org.conf /download/httpd.conf
 ADD mirrorbrain.conf /download/mirrorbrain.conf
 RUN chown -R download:download /download
 
+RUN sed -i 's/d.adsrc/pg_catalog.pg_get_expr(d.adbin, d.adrelid)/' \
+        /usr/lib/python2.7/site-packages/sqlobject/postgres/pgconnection.py
+
 USER download
 
 ENTRYPOINT ["/entrypoint.sh"]