Tinycheck ioc file

[jbrinksmeier]

This PR wants to create a file indicators-for-tinycheck.json for each release via github actions. This file shall then be used as additional source of stalkerware IOCs for the tinycheck tool.
The file will contain IOC objects for the known domains in network.csv and the certificates in certificates.csv and it's most recent version shall be downloadable via https://github.com/Te-k/stalkerware-indicators/releases/download/indicators-for-tinycheck.json

For this, you need to create a secret RELEASE_TOKEN in this repository with a github token with repo permissions. Then, whenever a release has been created, this workflow will checkout the repo, run create-indicatory-for-tinycheck.py and push the created file to the release assets. Example can be seen here: https://github.com/jbrinksmeier/stalkerware-indicators/releases

The file is meant to be compatible for the generic watcher script of tinycheck: https://github.com/KasperskyLab/TinyCheck/blob/main/server/backend/watchers.py

Example domain ioc:

    {
      "type": "domain",
      "tag": "stalkerware",
      "tlp": "white",
      "value": "flushdata.1topspy.com"
    }

Example certificate ioc:

    {
      "type": "sha1cert",
      "tag": "stalkerware",
      "tlp": "white",
      "value": "3E929DB5941C185EA4FAC2B0D7BA7589D40A379E"
    }