Add attested Consul mesh admission example #1

Job	Run time
build (webdemo, consul-postgres-ha/stage3b/webdemo)	42s
build (signaling, consul-postgres-ha/phase0/icetest)	54s
build (mesh-conn, consul-postgres-ha/stage4/mesh-conn)	56s
build (patroni, consul-postgres-ha/stage4/patroni)	45s
build (bootstrap-secrets, consul-postgres-ha/stage4/bootstrap-secrets)	1m 6s
build (sidecar, consul-postgres-ha/stage3b/sidecar)	46s
	5m 9s

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