[ci] add squeak.sista.spur build for linux64x64#728

LinqLover wants to merge 1 commit intoOpenSmalltalk:CogOpenSmalltalk/opensmalltalk-vm:Cogfrom

LinqLover:linux64x64/squeak.sista.spurLinqLover/opensmalltalk-vm:linux64x64/squeak.sista.spurCopy head branch name to clipboard