ci: use upx to compress the binary

fix(service/gemini): grammar fix in prompt

ci: update release workflow to use ubuntu-latest

Updates the release workflow to use ubuntu-latest as the runner.

chore: Bump up version number to 0.0.2

ci: introduce build and publish workflows

Introduce three workflows:
- `build`: builds the Geminicommit binary for multiple architectures and operating systems.
- `publish`: publishes the builds to my personal AUR.
- `release`: creates a GitHub release when a new git tag is pushed.