Dockerfile: mitigate certain supply chain attacks using sha256sums #58

Job	Run time
Create build container image	9s
Run pre-commit	10s
List firmware manifests	2s
Firmware builder (manifests/nabucasa/skyconnect_bootloader.yaml)	2m 5s
Firmware builder (manifests/nabucasa/skyconnect_openthread_rcp.yaml)	2m 6s
Firmware builder (manifests/nabucasa/skyconnect_zigbee_ncp.yaml)	1m 57s
Firmware builder (manifests/nabucasa/yellow_bootloader.yaml)	1m 55s
Firmware builder (manifests/nabucasa/yellow_openthread_rcp.yaml)	2m 8s
Firmware builder (manifests/nabucasa/yellow_zigbee_ncp.yaml)	2m 5s
Firmware builder (manifests/nabucasa/zwave_stick.yaml)	2m 2s
Generate manifest	1m 28s
Upload release assets	0s
	16m 7s

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