CI coverage: build coverage report

Test coverage is now measured separately for each test run and combined together after that. Resulting HTML pages can be downloaded from artifacts. Publication as Gitlab pages should theoretically work but needs furher setup outside of repo.

@pspacek I think I've done what needs to be done from https://about.gitlab.com/2016/11/03/publish-code-coverage-report-with-gitlab-pages/ here. I don't know how to access the pages though, I guess you need to set up a CNAME (or wildcard under gitlab.labs.nic.cz to be able to see the pages), see: https://docs.gitlab.com/ee/user/project/pages/introduction.html#add-a-custom-domain-to-your-pages-website

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• 16a85117 - fix gitignore

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This is suspicious:

genhtml: WARNING: cannot read /builds/knot/knot-resolver/.local/lib/kdns_modules/priming.lua!
genhtml: WARNING: cannot read /builds/knot/knot-resolver/.local/lib/kdns_modules/predict.lua!
genhtml: WARNING: cannot read /builds/knot/knot-resolver/.local/lib/kdns_modules/kres.lua!

Except for lua modules the output looks OK (I downloaded the artifact archive). I know little about github pages, but we use it here so it shouldn't be too difficult. Browsing artifacts directly through the CI links is broken ATM.

@vcunat The tests run after install (installcheck), so it tracks coverage of the installed files. I'll have to rewrite this into source paths at some point, but it's good enough to track coverage for now.

The gitlab pages is for browsing coverage report without the need to download artifacts. It needs to be configured though in gitlab, which I'm not sure it is. If you already use it, please let me know how.

@vavrusam Our Gitlab guru is looking into it but we are not there yet. I will test and merge this when it is ready.

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• 16a85117...07ff6fda - 43 commits from branch master
• ba220f11 - ci: build coverage report and publish to pages
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• da41be1f - WIP: fix cannot read .local/lib/kdns_modules errors

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marked as a Work In Progress from da41be1f144d5b113e73ba5e18fc44b08ec10e0a

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• 86480efe - CI coverage: handle Lua code coverage properly
• 0b38fe1b - CI coverage: add missing Lua files to the report

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• da4a79d9 - daemon: gather luacov statistics from early start
• f34fbcef - WIP: parallel code coverage

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• 6de2229a - WIP: gitlab debug

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• 77af3465 - daemon: gather luacov statistics from early start
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• db0d42c9 - fixup! build: added make coverage to compute C and Lua code coverage

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unmarked as a Work In Progress

changed title from WIP: ci: build coverage report and publish to pages to CI coverage: build coverage report

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merged

mentioned in commit 81a77557