Create Docker builds on Github releases

[holtgrewe]

Is your feature request related to a problem? Please describe.
Having a release on crates.io is nice (#5). However, we should also build docker images.

Describe the solution you'd like
Build docker images.

Describe alternatives you've considered
N/A

Additional context

• Extend Docker startup scripts #12

[holtgrewe]

It looks like musl builds won't work at the moment.

rust-lang/rust#95926