Notably:
- We now always provide our own copies of both `shellcheck` and `shfmt` (via `get_sources.sh`)
- Set-up of the pre-commit hook is now at `lint-hook.sh`, so we can call it directly (and give users a way to set-up the hook directly if necessary)
- The `lint` CI stage is now performed on Fedora instead of Alpine (like the rest of the build process), but only the minimal set-up is performed to download and set-up the necessary tools
Signed-off-by: celenity <celenity@celenity.dev>