Improve publishing setup

Auto-create a github release as per

https://github.com/simonpoole/OpeningHoursParser/commit/3e179e4ae371fc66502b8bf5602a0b39ace49cfa

and

https://github.com/simonpoole/OpeningHoursParser/commit/966ed262c161ccf8a400aa4800fd58cd4544c957