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Added a Dockerfile to build Docker containers, with base image python:3.x. The Dockerfile is in the project root directory.
Added a CI stage build-docker with one job that builds an image based on python:3.9. The job runs on the CNAF gitlab runner (tag: cnaf).
The job is triggered when a new tag is created. Optionally, it can be triggered by MR to the main branch. The YAML file of the job is stored in the docker dir.
Created two scripts for building images locally (not required for the CI job). README is included.