[gnome-runtime-images] Base: use nightly.gnome.org as a remote

[Jordan Petridis <jpetridis src gnome org>]

commit b8b9ffddaf23a1d22e7e6ca99121f8a0b57a2dff
Author: Julian Sparber <julian sparber net>
Date:   Thu Nov 7 11:15:48 2019 +0100

    Base: use nightly.gnome.org as a remote

 base | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/base b/base
index a95c290..aaafa31 100644
--- a/base
+++ b/base
@@ -10,7 +10,7 @@ RUN dnf -y update && \
     dnf clean all
 
 RUN flatpak remote-add flathub https://dl.flathub.org/repo/flathub.flatpakrepo && \
-    flatpak remote-add gnome-nightly https://sdk.gnome.org/gnome-nightly.flatpakrepo && \
+    flatpak remote-add gnome-nightly https://nightly.gnome.org/gnome-nightly.flatpakrepo && \
     flatpak remote-add flathub-beta https://flathub.org/beta-repo/flathub-beta.flatpakrepo
 
 # Add a machine-id as specified in the freedesktop spec: