ci: add commit sha on nigthly image tags

[luislhl]

Acceptance Criteria

• Add the git commit sha in nightly Docker images tag

Notes

For the schedule event, which is the one we use to build nightlies, the commit sha of the default branch is the one included in the build context: https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#schedule

This is enough for us, since we will always build nightlies from the default branch.

[codecov]

Codecov Report

Merging #545 (63c53d7) into dev (adc0ac5) will increase coverage by 0.01%.
The diff coverage is 88.23%.

@@            Coverage Diff             @@
##              dev     #545      +/-   ##
==========================================
+ Coverage   83.20%   83.21%   +0.01%     
==========================================
  Files         211      211              
  Lines       18646    18658      +12     
  Branches     2590     2592       +2     
==========================================
+ Hits        15514    15527      +13     
+ Misses       2563     2562       -1     
  Partials      569      569              

Impacted Files	Coverage Δ
hathor/event/model/base_event.py	92.30% <ø> (ø)
hathor/pubsub.py	94.73% <ø> (-0.20%)	⬇️
hathor/event/event_manager.py	94.87% <84.61%> (-2.15%)	⬇️
hathor/builder.py	78.96% <100.00%> (+0.52%)	⬆️
hathor/manager.py	70.13% <100.00%> (+0.08%)	⬆️

... and 4 files with indirect coverage changes

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