Check the folder content in new version of the agent on macos (#797)

* disable pushing autoupdate file on s3 for testing purposes
also set prerelease: true for the github release, so that we can perform tests

* we check if the bundle is already there

* fix typo

* Revert "disable pushing autoupdate file on s3 for testing purposes"

This reverts commit 61373da.

Author: umbynos

Diff for: main.go

@@ -453,7 +453,7 @@ func oldInstallExists() bool {
 	if binIsOld {
 		return false
 	}
-	return oldAgentPath.Exist()
+	return oldAgentPath.Join("ArduinoCreateAgent.app").Exist()
 }
 
 // printDialog will print a GUI error dialog on macos

Diff for: updater/updater_darwin.go

@@ -59,7 +59,7 @@ func checkForUpdates(currentVersion string, updateURL string, cmdName string) (s
 	if currentAppPath.Ext() != ".app" {
 		return "", fmt.Errorf("could not find app root in %s", executablePath)
 	}
-	oldAppPath := currentAppPath.Parent().Join("ArdiunoCreateAgent.old.app")
+	oldAppPath := currentAppPath.Parent().Join("ArduinoCreateAgent.old.app")
 	if oldAppPath.Exist() {
 		return "", fmt.Errorf("temp app already exists: %s, cannot update", oldAppPath)
 	}