fix: add custom builder for tito

[StykMartin]

Tito by default is creating new tarballs as {project-name}-{version}. This is a problem when Source0 contains only {version}.

Signed-off-by: Martin Styk mastyk@redhat.com

Maintainers will complete the following section:

• [x] Commit messages are descriptive enough
• [x] "Signed-off-by:" line is present in each commit
• [x] Code coverage from testing does not decrease and new code is covered
• [x] JSON/YAML configuration changes are updated in the relevant schema
• [x] Pull request includes link to an osbs-docs PR for user documentation updates

[MartinBasti]

/packit copr-build

[MartinBasti]

no release notes needed