update test workflow to ubuntu 20.04 #1189

Job	Run time
Build binaries for darwin-arm64	2m 23s
Build binaries for darwin-arm64	2m 23s
Build binaries for darwin-arm64	2m 23s
Build binaries for darwin-arm64	2m 23s
Build binaries for darwin-amd64	5m 26s
Build binaries for darwin-amd64	5m 26s
Build binaries for darwin-amd64	5m 26s
Build binaries for darwin-amd64	5m 26s
Build binaries for linux-arm64	1m 55s
Build binaries for linux-arm64	1m 28s
Build binaries for linux-arm64	1m 38s
Build binaries for linux-arm64	1m 34s
Build binaries for linux-amd64	1m 39s
Build binaries for linux-amd64	2m 5s
Build binaries for linux-amd64	1m 44s
Build binaries for linux-amd64	4m 17s
Build binaries for windows-amd64	4m 48s
Build binaries for windows-amd64	4m 48s
Build binaries for windows-amd64	4m 48s
Build binaries for windows-amd64	4m 48s
Build binaries for linux using tensorflow	4m 32s
Build binaries for linux using tensorflow	4m 32s
Build binaries for linux using tensorflow	4m 32s
Build binaries for linux using tensorflow	4m 32s
Upload artifacts to google bucket	0s
Upload artifacts to google bucket	0s
Upload artifacts to google bucket	0s
Upload artifacts to google bucket	0s
	1h 24m 56s

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