[gnome-builder/wip/albfan/flatpak-plugin-extensions] flatpak: Add plugin extension point

[Alberto Fanjul <albfan src gnome org>]

commit 788b65d1e1b638ca93dce10a56ac649594397d98
Author: Alberto Fanjul <albertofanjul gmail com>
Date:   Wed Apr 8 02:06:57 2020 +0200

    flatpak: Add plugin extension point

 build-aux/flatpak/org.gnome.Builder.json | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/build-aux/flatpak/org.gnome.Builder.json b/build-aux/flatpak/org.gnome.Builder.json
index b418feb4c..55aadce5c 100644
--- a/build-aux/flatpak/org.gnome.Builder.json
+++ b/build-aux/flatpak/org.gnome.Builder.json
@@ -8,6 +8,17 @@
         "nightly"
     ],
     "desktop-file-name-prefix" : "(Nightly) ",
+    "add-extensions": {
+        "org.gnome.Builder.Plugin": {
+            "version": "master",
+            "directory": "extensions",
+            "add-ld-path": "lib",
+            "merge-dirs": "lib/gnome-builder/plugins",
+            "subdirectories": true,
+            "no-autodownload": true,
+            "autodelete": true
+        }
+    },
     "finish-args" : [
         "--require-version=1.0.0",
         "--allow=devel",