Add artifact stage (#5603)
Add artifact stage (#5603)

* Add artifact stage

* Fix parallel artifact stages

* Fix branch-2.8 releases
splicemachine/spliceengine,splicemachine/spliceengine,splicemachine/spliceengine,splicemachine/spliceengine,splicemachine/spliceengine,splicemachine/spliceengine,splicemachine/spliceengine