CI: Run workflow on push/pull_request to "main"

[avdv]

Description

The default branch has been renamed (see #504) and this needs to change too.

• Relevant Issues : (none)
• Relevant PRs : (none)
• Type of change :
  • New feature
  • Bug fix for existing feature
  • Code quality improvement
  • Addition or Improvement of tests
  • Addition or Improvement of documentation

[codecov-commenter]

Codecov Report

Merging #507 (6178299) into main (0b61d73) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #507   +/-   ##
=======================================
  Coverage   89.32%   89.32%           
=======================================
  Files           8        8           
  Lines         562      562           
=======================================
  Hits          502      502           
  Misses         60       60           

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