[gnome-software/wjt/flatpak-manifest-main] flatpak: Specify 'main' branch for gnome-software

[Will Thompson <wjt src gnome org>]

commit c85f24b071fcf793eb94248723d2ad5ae238348c
Author: Will Thompson <will willthompson co uk>
Date:   Sat Jul 31 08:24:25 2021 +0100

    flatpak: Specify 'main' branch for gnome-software
    
    flatpak-builder defaults to 'master' if the branch is not specified.
    Since gnome-software's mainline branch was renamed to 'main', the
    Flatpak build now fails:
    
        $ flatpak-builder --disable-updates --install --user --force-clean _app 
contrib/org.gnome.SoftwareDevel.json
        Emptying app dir '_app'
        Downloading sources
        Fetching full git repo https://gitlab.gnome.org/GNOME/gnome-software.git
        fatal: ambiguous argument 'master': unknown revision or path not in the working tree.
        Use '--' to separate paths from revisions, like this:
        'git <command> [<revision>...] -- [<file>...]'
        Failed to download sources: module gnome-software: Child process exited with code 128
    
    CI continues to work because that build stops at the last module, and
    then builds it from the local source tree.

 contrib/org.gnome.SoftwareDevel.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/contrib/org.gnome.SoftwareDevel.json b/contrib/org.gnome.SoftwareDevel.json
index 941f00f10..8f4916f99 100644
--- a/contrib/org.gnome.SoftwareDevel.json
+++ b/contrib/org.gnome.SoftwareDevel.json
@@ -194,7 +194,8 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://gitlab.gnome.org/GNOME/gnome-software.git";
+                    "url": "https://gitlab.gnome.org/GNOME/gnome-software.git";,
+                    "branch": "main"
                 }
             ]
         }