spec: Switch to using the source from the github tag

This switches to using the forge macros for building Lorax on Fedora.
The nodist macro is needed because the github tag includes the release
but not the dist.

lorax.spec

@@ -1,19 +1,20 @@
 # NOTE: This specfile is generated from upstream at https://github.com/rhinstaller/lorax
 # NOTE: Please submit changes as a pull request
 %define debug_package %{nil}
+%global forgeurl https://github.com/weldr/lorax
 
 Name:           lorax
 Version:        41.0
 Release:        1%{?dist}
 Summary:        Tool for creating the anaconda install images
-
 License:        GPL-2.0-or-later
-URL:            https://github.com/weldr/lorax
-# To generate Source0 do:
-# git clone https://github.com/weldr/lorax
-# git checkout -b archive-branch lorax-%%{version}-%%{release}
-# tito build --tgz
-Source0:        %{name}-%{version}.tar.gz
+
+# Get the release without the dist
+%define nodist %{lua:r = string.gsub(rpm.expand("%{release}"), rpm.expand("%{?dist}"), ""); print(r)}
+%global tag %{name}-%{version}-%{nodist}
+%forgemeta
+Url:            %{forgeurl}
+Source0:        %{forgesource}
 
 BuildRequires:  python3-devel
 BuildRequires:  python3-setuptools
@@ -129,7 +130,7 @@ Lorax templates for creating the boot.iso and live isos are placed in
 /usr/share/lorax/templates.d/99-generic
 
 %prep
-%autosetup -p1 -n %{name}-%{version}
+%forgeautosetup
 
 %build