ci: ignore build steps for dependabot

[fmartingr]

• Ignore builds for dependabot (since they do not have push permissions)
• Ignore delete-tag step for closed pull requests coming from forks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.28%. Comparing base (ed15f14) to head (114ba92).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1033   +/-   ##
=======================================
  Coverage   34.28%   34.28%           
=======================================
  Files          61       61           
  Lines        5393     5393           
=======================================
  Hits         1849     1849           
  Misses       3320     3320           
  Partials      224      224           

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