currentRelease only gets set at very beginning

[SolomonShorser-OICR]

In many Jenkinsfiles, the variable currentRelease only gets set at the very beginning, in the first stage/step of a pipeline. If a pipeline fails and needs to be restarted from a stage in the middle, currentRelease will be null. This needs to be addressed as it is very time-consuming to start a multi-hour pipeline from the beginning, because a minor step near the end failed. A better way to set currentRelease needs to be found so that any pipeline restarted with the "Restart From Stage..." functionality will work as expected.

[cookersjs]

Oh, this is interesting! I have actually never tried to run the 'Restart From Stage' functionality. It sure would be nice if it held the same environment from the previous run so that the variables were still the same -- ah well. Lots of testing to do!