dockerfile: Improvements to reduce image layers
dockerfile: Improvements to reduce image layers

basu96/crux-judge,CRUx-BPHC/crux-judge,basu96/crux-judge,CRUx-BPHC/crux-judge,basu96/crux-judge,basu96/crux-judge,CRUx-BPHC/crux-judge,basu96/crux-judge