Update list of authors

Sign all RPMs and fix gh release command

* Use the correct path pattern for all the RPMs to upload for the
  release
* Add a (redundant) check that the release tag already exists
* For the moment create the release as a draft

Add CI workflow to build RPMs

Update spec to 2.1.2-0

Merge pull request #133 from italiangrid/110-error-string-handling-fo…

…r-openssl-300-needs-further-fixing

Avoid function names when printing OpenSSL errors

Merge pull request #133 from italiangrid/110-error-string-handling-fo…

…r-openssl-300-needs-further-fixing

Avoid function names when printing OpenSSL errors

Fix problem with newer gsoap versions. (#125)

Merge pull request #101 from italiangrid/centos9

Port to CentOS 9 Stream (OpenSSL 3)

Restore clients build

Merge pull request #90 from italiangrid/develop

Align develop-2.1.x with develop