Provide .spec file for RPM building from tarball

[nkadel]

I've some functional files for RPM building over at https://github.com/nkadel/ansiblerepo/blob/master/ansible-5.x-srpm/ansible.spec

It would be reasonable straightforward to turn that into a .j2 file which would allow "rpmbuilt -ta" from the ansible tarball, if desired, and potentially support a "--redhat" option to go along with the "--debian" packaging option.

[webknjaz]

May I suggest using https://packit.dev instead of (or additionally to) templating? That project exists specifically to allow having upstream spec files and they may even provide continuous testing on their platform via a GitHub App at https://github.com/marketplace/packit-as-a-service.

[nkadel]

I strongly dislike this idea. The point is to get the tarball, itself, to contain the matching .spec file, and to be able to run the command "rpmbuild -ta ansible-5.0.1.tar.gz" to generate a locally assembled RPM.