Dockerfile: mitigate certain supply chain attacks using sha256sums #57

Job	Run time
Run pre-commit	13s
List firmware manifests	4s
Create build container image	11s
Firmware builder (manifests/nabucasa/skyconnect_bootloader.yaml)	1m 53s
Firmware builder (manifests/nabucasa/skyconnect_openthread_rcp.yaml)	2m 14s
Firmware builder (manifests/nabucasa/skyconnect_zigbee_ncp.yaml)	2m 1s
Firmware builder (manifests/nabucasa/yellow_bootloader.yaml)	1m 52s
Firmware builder (manifests/nabucasa/yellow_openthread_rcp.yaml)	2m 7s
Firmware builder (manifests/nabucasa/yellow_zigbee_ncp.yaml)	2m 3s
Firmware builder (manifests/nabucasa/zwave_stick.yaml)	2m 5s
Generate manifest	1m 27s
Upload release assets	0s
	16m 10s

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