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@@ -141,7 +141,6 @@ no OCaml warnings build Coq in parallel with other tests.
### GitLab and Windows
-
If your repository has access to runners tagged `windows`, setting the
secret variable `WINDOWS` to `enabled` will add jobs building Windows
versions of Coq (32bit and 64bit).
@@ -155,6 +154,10 @@ System and opam packages are installed in a Docker image. The image is
automatically built and uploaded to your GitLab registry, and is
loaded by subsequent jobs.
+**IMPORTANT**: When updating Coq's CI docker image, you must modify
+the `CACHEKEY` variable in `.gitlab-ci.yml`, `.circleci/config.yml`,
+and `Dockerfile`.
+
The Docker building job reuses the uploaded image if it is available,
but if you wish to save more time you can skip the job by setting
`SKIP_DOCKER` to `true`.