Added support for uploading the zipped gatk file on a nightly basis to google buckets (#3371)
Added support for uploading the zipped gatk file on a nightly basis to google buckets (#3371)

For now builds of the gatk will be published to gs://gatk-nightly-builds

fixes #3168
frank-y-liu/gatk,ksthesis/gatk,broadinstitute/hellbender,broadinstitute/hellbender,magicDGS/gatk,frank-y-liu/gatk,ksthesis/gatk,ksthesis/gatk,frank-y-liu/gatk,frank-y-liu/gatk,broadinstitute/hellbender,broadinstitute/hellbender,broadinstitute/hellbender,magicDGS/gatk,magicDGS/gatk,ksthesis/gatk,frank-y-liu/gatk,broadinstitute/hellbender,magicDGS/gatk,frank-y-liu/gatk,magicDGS/gatk,ksthesis/gatk,ksthesis/gatk,magicDGS/gatk