🪲 Fix failing main publish action

[janjakubnanista]

In this PR

• Fixing the HOME directory for a containerized action (it's always /__w/<repository name>/<repository name> as asked here
  • Here we need to use $GITHUB_WORKSPACE environment variable instead of the ${{ github.workspace }} context - see here
• Fixing problems with dubious ownership as described here
  • A possible solution is to change the docker user as described here but this, as seen when debugging, will still not change the owner of files coming from checkout action