Use an environment variable to set the git revision

Jordi Massaguer Plarequested to merge
jordi_m_p/libnvidia-container:use_git_revision_from_env_variable into master

When packaging, you cannot expect to have the .git since the released tarball does not contain that. Thus, it is needed to be able to use an environment variable to set the git revision.

Note, if you do not set that variable, you still get the revision running the git command.

Signed-off-by: Jordi Massaguer Pla jmassaguerpla@suse.de

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