Optimize Docker Image size

[castrapel]

The docker image is unnecessarily large. There are optimizations we can do to reduce it, ie: The ones described here.

[veeral-patel]

@castrapel cool! just read through the article and summarized it below so future contributors don't need to read the whole thing to get started on this.

• [ ] use a .dockerignore file
• [ ] use a smaller base image
• [ ] use multi-stage builds
• [ ] avoid adding unnecessary layers
• [ ] avoid installing unnecessary dependencies
• [ ] for caching: place instructions that are likely to change as low in the Dockerfile as possible

currently, am trying to build a Docker image using python3.8-alpine, not python3.8 as we are now.

[veeral-patel]

Went ahead and built consoleme's current Dockerfile locally, using docker build -t consoleme ..

Resulting image is 2.73 GB, so we can compare future optimizations.