Added tool to package LbEnv as RPM

Ben Couturier requested to merge GitPackager into master

Added a simple tool to package a git repo as a RPM usable within LHCb.

  • The name of the repo should be the name of the project.
  • There must be a tag corresponding to the version being produced.

The script does not build, it just packages the content of the repo in the RPM

P.S. extra "requires" statements can be added

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