Add automated tests

[Alkarex]

Please consider adding some (automated) tests, in particular to ensure compatibility with FreshRSS.
See example
Joedmin/xExtension-wallabag-button#1

On the main extensions repo, this extension is generating a warning, which would be nice to get rid of:

------ ------------------------------------------------------------------------------------------- 
  Line   third-party/003df625d41b62458ad6771961c1bddc4fe76d3b/xExtension-SendToMyJD2/extension.php  
 ------ ------------------------------------------------------------------------------------------- 
  :305   Undefined variable: $lMD                                                                   
 ------ ------------------------------------------------------------------------------------------- 

[github-actions]

Stale issue message

[Alkarex]

What is the rationale for auto-closing issues (which are still relevant and unaddressed) on a repo that has had a total of 13 issues? ...