gnovm

feat: use buildx for multi-arch docker image #37

Job	Run time
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	16s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	35s
test (1.21.x, _test.cmd)	1m 17s
build (1.22.x, GOARCH=amd64 GOOS=linux, gno)	17s
test (1.21.x, _test.pkg)	37s
build (1.22.x, GOARCH=wasm GOOS=js, gno)	28s
test (1.21.x, _test.gnolang.native)	30s
test (1.21.x, _test.gnolang.stdlibs)	56s
test (1.21.x, _test.gnolang.realm)	27s
test (1.21.x, _test.gnolang.pkg0)	1m 41s
test (1.21.x, _test.gnolang.pkg1)	9m 53s
test (1.21.x, _test.gnolang.pkg2)	3m 55s
test (1.21.x, _test.gnolang.other)	26s
test (1.22.x, _test.cmd)	1m 20s
test (1.22.x, _test.pkg)	37s
test (1.22.x, _test.gnolang.native)	21s
test (1.22.x, _test.gnolang.stdlibs)	1m 25s
test (1.22.x, _test.gnolang.realm)	27s
test (1.22.x, _test.gnolang.pkg0)	1m 46s
test (1.22.x, _test.gnolang.pkg1)	9m 33s
test (1.22.x, _test.gnolang.pkg2)	4m 7s
test (1.22.x, _test.gnolang.other)	19s
upload-coverage	21s
	41m 34s

Provide feedback