[BUG] Multiconfiguration jobs' container can't start

[raydouglass]

Affects v0.0.3

$BUILD_TAG is used for the container name which is fine for freestyle jobs because it is $JOB_NAME-$BUILD_NUMBER such as test-job-100.

For Multiconfiguration jobs, the build tag is something like test-job-100-PARAM=abc,PARAM2=xyz which is not a legal docker container name.

Workaround:
Add a a parameter to the job called BUILD_TAG and set it so the value is unique using the matrix parameters & build number.
For example: test-job-$BUILD_NUMBER-$PARAM-$PARAM2 assuming the values of the parameters are in docker's legal character set of [a-zA-Z0-9_.-]