[gnome-commander] Uncommenting devel sources for Ubuntu in Dockerfile

[Uwe Scholz <uwescholz src gnome org>]

commit efb5944e1983a9b06b995f98a629b992f7f7676e
Author: Uwe Scholz <u scholz83 gmx de>
Date:   Sun Jan 27 18:46:24 2019 +0100

    Uncommenting devel sources for Ubuntu in Dockerfile

 Dockerfile | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/Dockerfile b/Dockerfile
index 59e697ac..db02b6d0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,6 +5,7 @@ MAINTAINER Uwe Scholz <u scholz83 gmx de>
 ENV GCMD_PATH /gnome-commander
 
 RUN \
+  sed -Ei 's/^# deb-src /deb-src /' /etc/apt/sources.list
   apt-get update -qq && \
   apt-get install -yq sudo && \
   echo $LANG && \