Line coverage for CI pipeline from external repositories

[immel-f]

Currently, the CI Pipeline for the repository contains a working line coverage check with lcov which is generated as a HTML artifact and as a comment under the commit/pull request. This works for pull requests and everything else in normal repos, but for pull requests from forks of public repositories, Github does not issue a write token for the Github actions. There is a blogpost from Github that describes the rationale behind this decision and a suggested workaround. Something similar would need to implemented here to allow comments with line coverage on external pull requests.

[github-actions]

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