make docker compile on freebsd

Signed-off-by: Alexey Guskov <lexag@mail.ru>

parsers/operatingsystem/operatingsystem_freebsd.go

@@ -0,0 +1,18 @@
+package operatingsystem
+
+import (
+	"errors"
+)
+
+// GetOperatingSystem gets the name of the current operating system.
+func GetOperatingSystem() (string, error) {
+	// TODO: Implement OS detection
+	return "", errors.New("Cannot detect OS version")
+}
+
+// IsContainerized returns true if we are running inside a container.
+// No-op on FreeBSD, always returns false.
+func IsContainerized() (bool, error) {
+	// TODO: Implement jail detection
+	return false, errors.New("Cannot detect if we are in container")
+}