Add binaries as assets when release

[tchapacan]

Purpose of this issue is to track a new feature that could be usefull for user seeking to directly download the binary that suit them from github.

• Update this workflow: https://github.com/tchapacan/livebox-exporter-rs/blob/main/.github/workflows/publish.yml
• When a new release event is catch, should publish docker Image to dockerhub (already implemented)
• When a new release event is catch, should publish raw binaries to asset in github release <== purpose of the issue

If multiple arch can be added it would be awesome !

- {os: "ubuntu-latest", target: "x86_64-unknown-linux-gnu", cross: false}
- {os: "ubuntu-latest", target: "armv7-unknown-linux-gnueabihf", cross: true}
- {os: "ubuntu-latest", target: "aarch64-unknown-linux-gnu", cross: true}