v2.2.0

Updates:

• If there are no changes in the local branch compared to the target branch (on the remote origin) the action will not push to the repository and go through a lot of unnecessary steps (#28).
• Using python:alpine Docker image instead of python:3.8 (#28).
  This is a much slimmer image, leading to a speed up in action build time.

Developer updates:

• Remove use of sleep parameter in CI (#28).
• Minor fixes, sanity upgrades and comments (#28).