Something weird is being happening lately, my extension is succesfully built but not uploaded to midas, see CDash
Is this a fake report? Since I can see the extension still available. Perhaps an old version that did not launch any warning to me, but certeinly wrong
Midas does not exist anymore. To fix the error, you would need to update the server address and get write permission to the new server, but probably what you want is to package without upload.
Following 43cc41a6b, the upload to midas only reports warnings in case of failure. Shortly we will update SlicerExtensionPackageAndUploadTarget.cmake to completely remove midas support.
Normally you just test packaging of your extension locally (and let factory machines build and upload the official packages to the extensions server). Why would you like to upload packages?