feat: add workflows for linting and building/releasing iso

[gardar]

• Adds workflow for linting code
  • Runs when :
    • Pushing
    • Pull requests created for master branch
• Adds workflow for building the iso and uploading it to github releases
  • Runs when:
    • On the end of the first date of every month, since archlinux releases are made on schedule the first date of month.
      • see: https://gitlab.archlinux.org/archlinux/releng/-/pipeline_schedules
      • uploads the iso as a new release in this repo.
    • On every pull request that's merged.
      • uploads the iso as a new prerelease in this repo.

Fixes #5

[stevleibelt]

This is looking great, thank you very much @gardar