feat: os-dependent default entrypoint

Co-authored-by: Roberto Abdelkader Martínez Pérez <robertomartinezp@gmail.com>

internal/server/control/control.go

@@ -132,6 +132,10 @@ func addRoute(res http.ResponseWriter, req *http.Request) {
 		return
 	}
 
+	if route.Entrypoint == "" {
+		route.Entrypoint = defaultEntrypoint
+	}
+
 	route.ID = id.String()
 
 	created := funcAdd(route)

internal/server/control/entrypoint.go

@@ -0,0 +1,5 @@
+// +build !windows
+
+package control
+
+var defaultEntrypoint = "/bin/sh -c"

internal/server/control/entrypoint_windows.go

@@ -0,0 +1,3 @@
+package control
+
+var defaultEntrypoint = "cmd.exe /c"