GitHub Action CI: Add Go source file format check #7786

Job	Run time
check-assets	8s
build (windows, amd64)	1m 5s
build (freebsd, 386)	1m 5s
build (windows, 386)	58s
build (openbsd, amd64)	1m 1s
build (openbsd, 386)	1m 4s
build (freebsd, amd64)	1m 8s
build (linux, arm, 6)	1m 16s
build (darwin, amd64)	1m 11s
build (android, amd64, android-amd64)	1m 26s
build (linux, arm, 7)	1m 12s
build (android, arm64)	1m 34s
build (windows, arm64)	1m 5s
build (linux, riscv64)	1m 9s
build (linux, arm64)	1m 10s
build (freebsd, arm64)	1m 3s
build (linux, s390x)	1m 10s
build (linux, amd64)	1m 3s
build (linux, loong64)	1m 5s
build (linux, mips64)	1m 3s
build (linux, mipsle)	1m 31s
build (linux, mips64le)	23s
build (linux, 386)	1m 7s
build (linux, mips)	1m 26s
build (darwin, arm64)	1m 6s
build (linux, ppc64)	1m 5s
build (openbsd, arm64)	53s
build (linux, ppc64le)	1m 7s
build (openbsd, arm, 7)	1m 26s
build (freebsd, arm, 7)	1m 9s
build (linux, arm, 5)	1m 11s
	34m 20s

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