[gnome-apps-nightly] Add gnome-boxes to the nightly apps

[Jordan Petridis <jpetridis src gnome org>]

commit 0cc05d53413f11c0a856cb197a4a58c0addfc80c
Author: Jordan Petridis <jordanpetridis protonmail com>
Date:   Fri Aug 3 12:29:37 2018 +0300

    Add gnome-boxes to the nightly apps

 org.gnome.Boxes.app | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/org.gnome.Boxes.app b/org.gnome.Boxes.app
new file mode 100644
index 0000000..eb31927
--- /dev/null
+++ b/org.gnome.Boxes.app
@@ -0,0 +1,3 @@
+ID=org.gnome.BoxesDevel
+JSON=build-aux/flatpak/org.gnome.Boxes.json
+GITURL=https://gitlab.gnome.org/GNOME/boxes.git