Support Serverless Framework v4 (#97)

Co-authored-by: Maciej Skierkowski <maciej@skierkowski.com>

Set node 18 on readme, v3.2

Upgrade to Node v16, Python v3.10 and switch back to slim image (#67)

* Use python-nodejs:python3.10-nodejs16-slim

* Update node and action versions

Add v2 info to readme since now master uses v3

Change readme usage

feat: use alpine version to reduce vulnerabilities in image (#51)

Add plugins example, closes #28

Update node version in README.md example

Bump serverless version to v2 (#41)

Explicit serverless version