trying to cross compile

MODULE.bazel

@@ -7,11 +7,16 @@ bazel_dep(name = "gazelle", version = "0.32.0")
 bazel_dep(name = "rules_go", version = "0.41.0")
 bazel_dep(name = "rules_oci", version = "1.3.0")
 bazel_dep(name = "rules_pkg", version = "0.9.1")
+bazel_dep(name = "platforms", version = "0.0.7")
 
 go_deps = use_extension("@gazelle//:extensions.bzl", "go_deps")
 go_deps.from_file(go_mod = "//:go.mod")
 use_repo(go_deps, "com_github_stretchr_testify", "org_uber_go_zap")
 
+
+toolchains = use_extension("@rules_go//go/toolchain:toolchains.bzl", "declare_constraints")
+toolchains.declare_constraints()
+
 oci = use_extension("@rules_oci//oci:extensions.bzl", "oci")
 oci.pull(
     platforms = ["linux/amd64"],

cmd/demo/BUILD.bazel

@@ -1,4 +1,4 @@
-load("@rules_go//go:def.bzl", "go_binary", "go_library")
+load("@rules_go//go:def.bzl", "go_binary", "go_library", "go_cross_binary")
 
 go_library(
     name = "demo_lib",
@@ -12,11 +12,26 @@ go_library(
 )
 
 go_binary(
-    name = "demo",
+    name = "base",
     embed = [":demo_lib"],
     visibility = ["//visibility:public"],
 )
 
+platform(
+    name = "darwin/amd64",
+    constraint_values = [
+        "@platforms//os:darwin",
+        "@platforms//cpu:amd64",
+    ],
+)
+
+go_cross_binary(
+    name = "macOS",
+    platform = "@bazel_tools//platforms:osx",
+    sdk_version = "1.21.0",
+    target = "base",
+)
+
 load("@rules_pkg//:pkg.bzl", "pkg_tar")
 
 pkg_tar(