feat: add support for slim and alpine Python images + change default base image

mentioned in commit 8c3419f5

mentioned in merge request Orange-OpenSource/lfn/ci_cd/chained-ci-py!268 (merged)

mentioned in merge request gaia-x/data-infrastructure-federation-services/deployment-scenario/credential-generator!87 (closed)

mentioned in merge request to-be-continuous/samples/python-with-gcp-wif!10 (merged)

mentioned in merge request to-be-continuous/samples/python-library!24 (merged)

mentioned in merge request gaia-x/data-infrastructure-federation-services/deployment-scenario/vc-issuer!45 (closed)

mentioned in merge request gaia-x/data-infrastructure-federation-services/deployment-scenario/user-agent!85 (closed)