[Xen-devel] [RFC PATCH 6/6] ci: add a README about the containers

[Doug Goldstein <cardoe@xxxxxxxxxx>]

Add a basic README explaining the containers and how people can use them
to locally test with if they see an error in CI and want to reproduce it
locally.

Signed-off-by: Doug Goldstein <cardoe@xxxxxxxxxx>
---
 extras/testing/README.md | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 extras/testing/README.md

diff --git a/extras/testing/README.md b/extras/testing/README.md
new file mode 100644
index 0000000..0908a66
--- /dev/null
+++ b/extras/testing/README.md
@@ -0,0 +1,29 @@
+Docker Containers
+=================
+
+These Docker containers should make it possible to build Xen in
+any of the available environments on any system that supports
+running Docker. They are organized by distro and tagged with
+the version of that distro. They are available from the GitLab
+Container Registry under the Xen project at:
+
+registry.gitlab.com/cardoe/xen/DISTRO:VERSION
+
+The available ones are:
+- centos:7.2
+- debian:jessie
+- ubuntu:trusty
+- ubuntu:xenial
+
+To Build Xen
+------------
+
+From the top level of the source tree it should be possible to
+run the following:
+
+docker run --rm -it -v $(PWD):/build -u $(id -u) -e CC=gcc $(CONTAINER) make
+
+There are other modifications that can be made but this will run
+the `make` command inside the specified container. It will use your
+currently checked out source tree to build with, ensure that file
+permissions remain consistent and clean up after itself.
-- 
git-series 0.9.1

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