Publish release tags for containers, on release

[jlenain]

This PR adds the possibility to publish release tags, on releases, for containers. Doing so, the users will have a better visibility on which nectarchain version they are instantiating:

apptainer shell oras://ghcr.io/cta-observatory/nectarchain:v0.1.7

instead of just:

apptainer shell oras://ghcr.io/cta-observatory/nectarchain

Before, to pin a particular version during the instantiation, one had to provide a specific SHA256 hash, such as:

apptainer shell oras://ghcr.io/cta-observatory/nectarchain:sha256:94c18526e2095b6d4bff17cef3f9a50ffb6e46f84b1e55ea5d0ae56c55abf90b

which was not very handy...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d062d8e) 30.82% compared to head (f0c1c7c) 30.82%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #100   +/-   ##
=======================================
  Coverage   30.82%   30.82%           
=======================================
  Files          60       60           
  Lines        3767     3767           
=======================================
  Hits         1161     1161           
  Misses       2606     2606           

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