[CI] Auto tag upon releasing a new version

[brian-mulier-p]

Issue description

A tag for the closed version should be added upon releasing a new version (eg. if we release 0.21.0 we should add a v0.20.x tag automatically

[brian-mulier-p]

Same thing should be done for blueprints repo

[hemantmm]

@brian-mulier-p, can I work on this issue?

[MilosPaunovic]

There are too many issues already assigned to you @hemantmm, let's give the opportunity to someone else to tackle this one.