If you change PowerCLI_Core.zip and master.zip to PowerCLI_Core.tar.gz and marster.tar.gz, reduce the script by removing rm lines (ADD command extract auto tar.gz)
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Reduce the image from 610MB to 555MB with best practice
See https://hackernoon.com/tips-to-reduce-docker-image-sizes-876095da3b34
If you change PowerCLI_Core.zip and master.zip to PowerCLI_Core.tar.gz and marster.tar.gz, reduce the script by removing rm lines (ADD command extract auto tar.gz)