Add initial support for RPM packaging (#121)

- Add gen-rpm
- Package rpm in CI testing and releases
- Remove fedora 33 from testing (end of life)
- Update arguments for `build_private.sh` and `build_sunshine.sh`

Co-authored-by: ReenigneArcher <42013603+ReenigneArcher@users.noreply.github.com>

scripts/Dockerfile-ubuntu_18_04

@@ -58,4 +58,4 @@ RUN cmake --version
 
 # Entrypoint
 COPY build-private.sh /root/build.sh
-ENTRYPOINT ["/root/build.sh"]
+ENTRYPOINT ["/root/build.sh", "-deb"]