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-rw-r--r--src/tools/ci/README17
1 files changed, 17 insertions, 0 deletions
diff --git a/src/tools/ci/README b/src/tools/ci/README
index 80d01939e84..30ddd200c96 100644
--- a/src/tools/ci/README
+++ b/src/tools/ci/README
@@ -65,3 +65,20 @@ messages. Currently the following controls are available:
Only runs CI on operating systems specified. This can be useful when
addressing portability issues affecting only a subset of platforms.
+
+
+Using custom compute resources for CI
+=====================================
+
+When running a lot of tests in a repository, cirrus-ci's free credits do not
+suffice. In those cases a repository can be configured to use other
+infrastructure for running tests. To do so, the REPO_CI_CONFIG_GIT_URL
+variable can be configured for the repository in the cirrus-ci web interface,
+at https://cirrus-ci.com/github/<user or organization>. The file referenced
+(see https://cirrus-ci.org/guide/programming-tasks/#fs) by the variable can
+overwrite the default execution method for different operating systems,
+defined in .cirrus.yml, by redefining the relevant yaml anchors.
+
+Custom compute resources can be provided using
+- https://cirrus-ci.org/guide/supported-computing-services/
+- https://cirrus-ci.org/guide/persistent-workers/