FR: Automatically submit all release files to VirusTotal

**Is your feature request related to a problem? Please describe.**
Currently, CopyQ release assets (files) don't appear to be submitted to VirusTotal for review. Although VirusTotal is far from perfect, it can offer some insights. Also, because many people use VirusTotal, submitting them will give you a heads-up before you get many issues reported if there are real or false positives.

**Describe the solution you'd like**
Automatically submit all release files to VirusTotal. You can use a GitHub action, if you like. https://github.com/cssnr/virustotal-action and https://github.com/crazy-max/ghaction-virustotal are 2 options, or you can roll your own.

**Describe alternatives you've considered**
Writing some code to download all the release files to cloud storage and uploading them to VirusTotal from there.