WIP: fix tests using bare port-numbers

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

cli/compose/loader/loader.go

@@ -917,6 +917,10 @@ var transformStringToDuration TransformerFunc = func(value any) (any, error) {
 }
 
 func toServicePortConfigs(value string) ([]any, error) {
+	// If no host-port is specified, historically, we included it as "ephemeral port"
+	if value != "" && !strings.Contains(value, ":") {
+		value = "0:" + value
+	}
 	// short syntax ([ip:]public:private[/proto])
 	//
 	// TODO(thaJeztah): we need an equivalent that handles the "ip-address" part without depending on the nat package.