ci/gha: fix cross-386 job vs go 1.19
ci/gha: fix cross-386 job vs go 1.19

When golang 1.19 is used to build unit tests on 386, it fails like this:

 sudo -E PATH="$PATH" -- make GOARCH=386 CGO_ENABLED=1 localunittest
 <...>
 go test -timeout 3m -tags "seccomp"  -v ./...
 <...>
 # github.com/opencontainers/runc/libcontainer/capabilities.test
 runtime/cgo(.text): unknown symbol __stack_chk_fail_local in pcrel
 runtime/cgo(.text): unknown symbol __stack_chk_fail_local in pcrel
 runtime/cgo(.text): unknown symbol __stack_chk_fail_local in pcrel
 runtime/cgo(.text): unknown symbol __stack_chk_fail_local in pcrel
 runtime/cgo(.text): unknown symbol __stack_chk_fail_local in pcrel
 runtime/cgo(.text): relocation target __stack_chk_fail_local not defined
 runtime/cgo(.text): relocation target __stack_chk_fail_local not defined

The fix is to add CGO_CFLAGS=-fno-stack-protector.

See also:
 - https://github.com/docker-library/golang/pull/426
 - https://go.dev/issue/52919
 - https://go.dev/issue/54313
 - https://go-review.googlesource.com/c/go/+/421935

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

opencontainers/runc,opencontainers/runc,opencontainers/runc,opencontainers/runc