gnovm

feat: use buildx for multi-arch docker image #36

Job	Run time
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	18s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	30s
test (1.21.x, _test.cmd)	1m 24s
build (1.22.x, GOARCH=amd64 GOOS=linux, gno)	16s
build (1.22.x, GOARCH=wasm GOOS=js, gno)	25s
test (1.21.x, _test.pkg)	38s
test (1.21.x, _test.gnolang.native)	32s
test (1.21.x, _test.gnolang.stdlibs)	45s
test (1.21.x, _test.gnolang.realm)	31s
test (1.21.x, _test.gnolang.pkg0)	1m 36s
test (1.21.x, _test.gnolang.pkg1)	5m 16s
test (1.21.x, _test.gnolang.pkg2)	3m 56s
test (1.21.x, _test.gnolang.other)	21s
test (1.22.x, _test.cmd)	1m 14s
test (1.22.x, _test.pkg)	37s
test (1.22.x, _test.gnolang.native)	22s
test (1.22.x, _test.gnolang.stdlibs)	46s
test (1.22.x, _test.gnolang.realm)	27s
test (1.22.x, _test.gnolang.pkg0)	1m 53s
test (1.22.x, _test.gnolang.pkg1)	3m 53s
test (1.22.x, _test.gnolang.pkg2)	3m 54s
test (1.22.x, _test.gnolang.other)	24s
upload-coverage	1s
	29m 59s

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