Wis2downloader

- Addition of unit tests
- Addition of super-linter
- Addition of dockerfile
- Automatic publishing to PyPI and GHCR

Addition of CLI

Fix of broken manifest.in

What's Changed
* Refactor - non dev mode, disk space limits and file naming

**Full Changelog**: https://github.com/wmo-im/wis2downloader/compare/0.1.1...v0.2.0

Fixes a mistake which caused the initial target validation to be broken.