Adds CI CD with deb for external deps

external-dependencies/deb-packages/buildingmodels/debian/control

@@ -0,0 +1,18 @@
+Source: libbuildingmodels-dev
+Section: libdevel
+Priority: optional
+Maintainer: Legatus Team <legatus@defence-elec.de>
+Build-Depends: debhelper (>= 12), qt6-base-dev
+Standards-Version: 4.6.0
+Vcs-Browser: https://internal-repo.sl.defence-elec.de/#browse/browse:external-rpms:general
+Vcs-Git: https://internal-repo.sl.defence-elec.de/git/external/buildingmodels.git
+
+Package: libbuildingmodels-dev
+Architecture: amd64
+Depends: libqt6core6, libqt6gui6, libqt6widgets6, ${shlibs:Depends}, ${misc:Depends}
+Description: BuildingModels library - development files
+ BuildingModels library for Legatus.
+ .
+ License: Standard (no special requirements)
+ .
+ This package contains the development files for BuildingModels library.