Move to 3.12 only + cut new version

Allow testing 3.12 so we be ready

Move version to cut a new docker push

Merge pull request #4 from cooperlees/dependabot/github_actions/docke…

…r/login-action-2

Bump docker/login-action from 1 to 2

Update to latest speedtest binary

- Fix docker build to latest instructions as per https://www.speedtest.net/apps/cli
- Go >= 3.10
- Update README on how to dev so it's easier next time
- Use a unittest once I got new JSON from using `--debug` causing the JSON to be printed to stdout

Test:
- Build new docker container and see metrics
- ``

Merge pull request #3 from cooperlees/cooperlees-new-version

Move version to 22.2.1

Move version to build docker image with new speedtest cli

Don't install debian OS python3 packages - waste of time

Actually push to the right docker repository

Upload to Docker on release cut