[gnome-builder] build: add vala-language-server

[Christian Hergert <chergert src gnome org>]

commit 34b1b95c3ced8a296b9e0bb34cda6ccf2cf48fb6
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jul 7 14:39:54 2021 -0700

    build: add vala-language-server

 build-aux/flatpak/org.gnome.Builder.json | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
---
diff --git a/build-aux/flatpak/org.gnome.Builder.json b/build-aux/flatpak/org.gnome.Builder.json
index f1986476d..7775252c0 100644
--- a/build-aux/flatpak/org.gnome.Builder.json
+++ b/build-aux/flatpak/org.gnome.Builder.json
@@ -590,6 +590,24 @@
                 }
             ]
         },
+        {
+            "name" : "vala-language-server",
+            "config-opts" : [
+                "--libdir=/app/lib",
+                "--buildtype=debugoptimized",
+                "-Dman-pages=disabled",
+                "-Dtests=false",
+                "-Dplugins=false"
+            ],
+            "buildsystem" : "meson",
+            "builddir" : true,
+            "sources" : [
+                {
+                    "type" : "git",
+                    "url" : "https://github.com/Prince781/vala-language-server.git";
+                }
+            ]
+        },
         {
             "name" : "gvls",
             "config-opts" : [