Fix Source0 in catdoc.spec to point to GitHub

Try to get Copr builds working

Author: skierpage

TODO.md

@@ -15,6 +15,7 @@
 ## Other CI issues
 
 - [ ] Check if [Fedora copr build](https://copr.fedorainfracloud.org/coprs/skierpage/catdoc/) (using [packit.yaml](packit.yaml)) of Fedora RPM works.
+- [ ] Why didn't uploading tag v0.97, or creating a release, do anything? They don't seem to have triigerred a build.
 
 
 ## Research: find more Office 2007 test files

catdoc.spec

@@ -4,7 +4,7 @@ Release: %autorelease
 Summary: programs which extract text from Microsoft Office 97-2004 files
 License: GPL-2.0-or-later
 URL: https://github.com/skierpage/catdoc
-Source0: catdoc-0.97.tar.gz
+Source0: https://github.com/skierpage/%{name}/archive/refs/tags/v%{version}.tar.gz
 BuildRequires: gcc
 BuildRequires: make
 BuildRequires: tk