.github/workflows: run python server from docker image

Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>

Author: tormath1

.github/workflows/run-kola-tests.yaml

@@ -161,7 +161,10 @@ jobs:
           set -x
           set -euo pipefail
 
-          python3 -m http.server -d "${TESTS_WEBSERVER_WEBROOT}" -b "${TESTS_WEBSERVER_IP}" "${TESTS_WEBSERVER_PORT}" &
+          mkdir -p "${TESTS_WEBSERVER_WEBROOT}"
+          docker run --rm -d --net host \
+            -v "${TESTS_WEBSERVER_WEBROOT}:${TESTS_WEBSERVER_WEBROOT}" \
+            docker.io/python python -m http.server -d "${TESTS_WEBSERVER_WEBROOT}" "${TESTS_WEBSERVER_PORT}"
 
           pushd scripts