Add explicit trust establishment #1437

Job	Run time
Code	1m 3s
System (1.22.x, add)	31m 43s
System (1.22.x, instances)	18m 29s
System (1.22.x, basic)	35m 9s
System (1.22.x, recover)	23m 27s
System (1.22.x, interactive)	30m 3s
System (1.22.x, mismatch)	22m 42s
System (1.22.x, preseed)	20m 50s
documentation-checks / Run documentation checks	1m 10s
Trigger snap edge build	0s
	3h 4m 36s

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