Develop package names

Packages for the develop branch of otb are available here. However the packages have the same names as the packages of the last release, for example OTB-7.1.0-Linux64.run. It would be better to have a name corresponding to the corresponding commit in otb repo.

@msavinaud suggested using git describe to generate the name of the package. This command return the last version tag, the number of commits since last version and the commit hash, for example with the last version of develop it returns :

7.1.0-144-g48c6e94

The name of the package would then be

OTB-7.1.0-144-g48c6e94-Linux64.run

This also applies to the Documentation and source tarballs.