Use writable macOS runner workdir

services/forgejo-nsc/internal/nsc/macos_test.go

@@ -0,0 +1,25 @@
+package nsc
+
+import "testing"
+
+func TestMacOSRunnerWorkDirUsesWritableEphemeralPath(t *testing.T) {
+	cases := []struct {
+		name       string
+		configured string
+		want       string
+	}{
+		{name: "empty", configured: "", want: "/tmp/forgejo-runner"},
+		{name: "linux var state", configured: "/var/lib/forgejo-runner", want: "/tmp/forgejo-runner"},
+		{name: "custom tmp", configured: "/tmp/custom-runner", want: "/tmp/custom-runner"},
+		{name: "home path", configured: "/Users/runner/forgejo-runner", want: "/Users/runner/forgejo-runner"},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			got := macosRunnerWorkDir(tc.configured)
+			if got != tc.want {
+				t.Fatalf("macosRunnerWorkDir(%q) = %q, want %q", tc.configured, got, tc.want)
+			}
+		})
+	}
+}