chore: reliable offline coverage reporting in local-ci - #89
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July 4, 2026 12:33
…al-ci The offline CI now installs the reportgenerator global tool on demand (mirroring .github/workflows/test.yml) instead of silently skipping the coverage report when it is absent. It also emits the same report types as CI — HTML, Cobertura, TextSummary and MarkdownSummaryGithub — so a local run produces SummaryGithub.md, the offline equivalent of the coverage summary CI posts to the PR.
Since GitHub Actions minutes are limited, local-ci now produces the same coverage markdown as CI (SummaryGithub.md) and can optionally post it to a PR as a single sticky comment via the gh CLI, gated behind POST_COVERAGE_PR=<num>. It edits a prior marked comment instead of spamming, mirroring the CI sticky comment. Posting is opt-in and never runs unless the variable is set; all posting failures are warnings that never fail the pipeline.
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Why
GitHub Actions minutes are a limited budget, and the full build + test + coverage matrix (
test.yml) is the most expensive workflow we run. Reserving it for every push/iteration burns through minutes fast.local-ci.shalready reproduces the build and tests offline — this PR makes its coverage reporting a first-class, reliable equivalent of what CI produces, so we can iterate locally and only spend Actions minutes when it actually matters.What changed (
scripts/local-ci.shonly)1. reportgenerator is now required, not optional
Previously the coverage step silently no-op'd if
reportgeneratorwasn't installed. Now it installs thedotnet-reportgenerator-globaltoolon demand (mirroringtest.yml) and puts the dotnet global-tools dir onPATH, so a local run always produces a coverage report.2. Same report artifacts as CI
Report types bumped from
TextSummaryonly →HtmlInline;Cobertura;TextSummary;MarkdownSummaryGithub— matchingtest.yml. A local run now emits:coverage/report/SummaryGithub.mdcoverage/report/index.htmlcoverage/report/Cobertura.xmlcoverage/report/Summary.txt3. Opt-in: post the summary to a PR as a single sticky comment
So the reliable local coverage can be shared on a PR without spending Actions minutes:
POST_COVERAGE_PR=88 ./scripts/local-ci.sh testPOST_COVERAGE_PR— never runs unless you set it.ghCLI. Finds a prior comment by a hidden marker (<!-- local-ci-coverage -->) and edits it instead of adding a new one, so repeated runs update one sticky comment — same UX as CI'ssticky-pull-request-comment.ghmissing, not authenticated, network) are warnings only — posting can never fail the pipeline.Notes
coverage/andtest-results/are already gitignored, so no artifacts get committed.Test
bash -n scripts/local-ci.sh— clean.reportgenerator ... -reporttypes:HtmlInline;Cobertura;TextSummary;MarkdownSummaryGithubagainst real cobertura output → producedSummaryGithub.md(27.3% line / 23.8% branch, 5 assemblies) + HTML + Cobertura.