containertool: Allow destination repository to be set by an environment variable #127
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Motivation
It is currently only possible to set the destination repository by specifying the mandatory
--repositoryflag. Setting the repository from an environment variable can be more convenient in scripts and in the terminal - the destination repository can be set once and inherited by all further builds in the same shell.Modifications
--repositoryis no longer a mandatory argument.CONTAINERTOOL_REPOSITORYenvironment variable is used if--repositoryis not set.Fixes #100
Result
Either
--repositoryorCONTAINERTOOL_REPOSITORYcan be used to define the destination repository. The command line flag takes precedence over the environment variable.Test Plan
All existing tests continue to pass.