add libflatpak-dev to CI

Author: stsdc

.github/workflows/publish-launchpad.yml

@@ -40,7 +40,7 @@ jobs:
           apt update
           apt install -y devscripts dput locales
           apt install -y libgala-dev libgee-0.8-dev libglib2.0-dev libgranite-dev libgtk-3-dev libhandy-1-dev libxnvctrl0 libxnvctrl-dev
-          apt install -y libdbus-glib-1-dev libwnck-3-dev libgtop2-dev libwingpanel-3.0-dev appstream debhelper libudisks2-dev libcurl4-gnutls-dev
+          apt install -y libdbus-glib-1-dev libwnck-3-dev libgtop2-dev libwingpanel-3.0-dev appstream debhelper libudisks2-dev libcurl4-gnutls-dev libflatpak-dev
           apt install -y meson valac sassc git
           
       - name: Set locale