docs(contributing): Add guide for running CI tests locally with tox-lsr

Signed-off-by: Wen Liang <liangwen12year@gmail.com>

Author: liangwen12year

contributing.md

@@ -118,3 +118,55 @@ explanation about the NetworkManager API.
     podman stop lsr-ci-c7
     podman rm lsr-ci-c7
     ```
+
+## Running CI Tests Locally
+
+### Use tox-lsr with qemu
+
+The latest version of tox-lsr supports qemu testing.
+<https://github.com/linux-system-roles/tox-lsr#qemu-testing>
+
+**Steps:**
+
+1. If you are using RHEL or CentOS, enable the EPEL repository for your
+   platform - <https://docs.fedoraproject.org/en-US/epel/>
+
+2. Use yum or dnf to install `standard-test-roles-inventory-qemu`
+   * If for some reason dnf/yum do not work, just download the script from
+     <https://pagure.io/standard-test-roles/raw/master/f/inventory/standard-inventory-qcow2>
+     * copy to your `$PATH`, and make sure it is executable
+
+3. Install tox
+   * Use yum/dnf to install `python3-tox` - if that does not work, then use
+     `pip install --user tox`, then make sure `~/.local/bin` is in your `$PATH`
+
+4. Install tox-lsr <https://github.com/linux-system-roles/tox-lsr#how-to-get-it>
+
+   ```bash
+   pip install --user git+https://github.com/linux-system-roles/tox-lsr@main
+   ```
+
+5. Download the config file to `~/.config/linux-system-roles.json` from
+   <https://gitlab.cee.redhat.com/rhel-system-roles/resources/-/raw/main/linux-system-roles.json>
+   * If you want to make changes to the config, file a merge request at
+     <https://gitlab.cee.redhat.com/rhel-system-roles/resources>
+
+   **WARNING:** Do not put secrets such as passwords, tokens, keys, etc. in
+   linux-system-roles.json - that should go into bitwarden.
+
+6. Assuming you are in a git clone of a role repo which has a tox.ini file -
+   you can use e.g.
+
+   ```bash
+   tox -e qemu-ansible-core-2.14 -- --image-name centos-9 tests/tests_default.yml
+   ```
+
+There are many command line options and environment variables which can be used
+to control the behavior, and you can customize the testenv in tox.ini. See
+<https://github.com/linux-system-roles/tox-lsr#qemu-testing>
+
+This method supports RHEL also - will download the latest image for a compose,
+and will set up the yum repos to point to internal composes.
+
+See <https://linux-system-roles.github.io/contribute.html> for general
+development guidelines.