Release 1.0.0 for marketplace listing

Fully functional, but still minimal implementation, that replaces the Ruby version of this GitHub Action.

v0.1.0-pre30

Update ENV vars and replace Result with Option

v0.1.0-pre29

Update ENV vars and replace Result with Option

v0.1.0-pre28

Update ENV vars and replace Result with Option

v0.1.0-pre27

Add GitHub CI for tests

Initially I planned to do the releaes management via Actions and GPR.
Unfortunately GPR creates tags and releases, which makes it hard to
create a normal CI/CD workflow, like automatically building a docker
image for each push and tagging images based on code tags.
The problem is, that after pushing a tagged image, a new tag would be
created by GPR which makes this workflow unfeasible.
Thus I decided to create images and tags manually to sidestep that
problem.

v0.1.0-pre26

Add second Dockerfile based on rust-musl-builder

v0.1.0-pre21

Add second Dockerfile based on rust-musl-builder

v0.1.0-pre20

Add GitHub CI

v0.1.0-pre19

Add GitHub CI