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+# CI support stuff
+
+## Docker image
+
+GitLab CI jobs run in a Docker image, defined here. To update that image
+(perhaps to install some more packages):
+
+1. Edit `.gitlab-ci/Dockerfile` with the changes you want
+1. Run `.gitlab-ci/run-docker.sh build --base=debian-stable --base-version=1` to
+ build the new image (bump the version from the latest listed for that `base`
+ on https://gitlab.gnome.org/GNOME/gnome-software/container_registry)
+1. Run `.gitlab-ci/run-docker.sh push --base=debian-stable --base-version=1` to
+ upload the new image to the GNOME GitLab Docker registry
+ * If this is the first time you're doing this, you'll need to log into the
+ registry
+ * If you use 2-factor authentication on your GNOME GitLab account, you'll
+ need to [create a personal access token][pat] and use that rather than
+ your normal password
+1. Edit `.gitlab-ci.yml` (in the root of this repository) to use your new
+ image
+
+[pat]: https://gitlab.gnome.org/-/profile/personal_access_tokens