De-duplicate identical annotations from problemMatchers

[phil-opp]

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CI builds often build the same project in multiple configurations (e.g. check and test, for different architectures, using different toolchains, with different features enabled, etc). As a result, compiler warnings might occur multiple times, which results in duplicated annotations in the GitHub UI when using problemMatchers.

For example, consider this extreme case where a variable is not used:

It would be very useful if GitHub Actions could de-dupliate such identical annotations and show each of them only once (maybe with a "occured X times" note).

[phil-opp]

I found the following related threads:

• De-duplicate identical issue annotations from problemMatchers actions/runner#504
  • closed because the issue is apparently not related to the runner application
• https://github.com/orgs/community/discussions/16661
  • received no feedback since 2022, probably because it was categorized under "Pull Requests" instead of "Actions"