Document how to use a universe with regular CI

fix #13
r-universe-org · Dec 9, 2024 · 33b8007 · 33b8007
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diff --git a/publish/debug-build.qmd b/publish/debug-build.qmd
@@ -29,3 +29,7 @@ No.
 R-universe is an open publishing system. 
 The system just builds and deploys R packages from git into personal cran-like repositories. 
 The owner of the universe is responsible for their own policies and quality control.
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+## How to use a universe on regular continous integration?
+
+If you want to test a package against versions of other packages that are in a universe, on GitHub Actions you can use the [`extra-repositories` field of the `r-lib/actions` setup-r action](https://github.com/r-lib/actions/tree/v2-branch/setup-r#inputs).