Change all legacy ENV statements to modern version #486

Job	Run time
Build and (conditionally) push Docker images (cli, alpine)	2m 52s
Build and (conditionally) push Docker images (cli, alpine)	7m 44s
Build and (conditionally) push Docker images (cli, debian)	2m 53s
Build and (conditionally) push Docker images (cli, debian)	6m 54s
Build and (conditionally) push Docker images (scan, alpine)	2m 51s
Build and (conditionally) push Docker images (scan, alpine)	7m 18s
Build and (conditionally) push Docker images (scan, debian)	2m 52s
Build and (conditionally) push Docker images (scan, debian)	7m 31s
Build and (conditionally) push Docker images (resolution, alpine)	2m 34s
Build and (conditionally) push Docker images (resolution, alpine)	10m 33s
Build and (conditionally) push Docker images (resolution, debian)	2m 55s
Build and (conditionally) push Docker images (resolution, debian)	8m 22s
	1h 5m 19s

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