feature: workflow to automate DAFNI push

[f-allian]

PR to containerise and upload to the DAFNI platform automatically using their API. Closes issue #255. The workflow performs the following two jobs:

1. Checks if the workflow has been automatically triggered, or if there has been a new release (i.e. for every major version update)
2. Builds the container as described in our Dockerfile, uploads to DAFNI, and logs out securely.

All secrets and environment variables have been appropriately defined.

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
⚠️ PYTHON	black	29		1	1.54s
✅ PYTHON	pylint	29		0	4.95s

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.61%. Comparing base (70d089f) to head (7dd2111).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #270   +/-   ##
=======================================
  Coverage   95.61%   95.61%           
=======================================
  Files          22       22           
  Lines        1572     1572           
=======================================
  Hits         1503     1503           
  Misses         69       69           

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