Bump Docker images to latest Python 3x

[titom73]

• bump(docker): Use latest python:3 image as base reference

❯ make
base                           Build a base image
build                          Build all dockers images (base and dnd)
dnd                            Build a docker in docker image
help                           Display help message
push                           Push the docker image to the registry

• make(docker): Implement basic .dockerignore to reduce image footprint
• Use same image name with correct docker repository

❯ docker images | grep eos
ghcr.io/titom73/eos-downloader   dnd-dev           8478fafe3f79   9 minutes ago    365MB
ghcr.io/titom73/eos-downloader   dev               11abd34375bc   13 minutes ago   289MB

[titom73]

Fixing #105