Fix CI user's PATH to include pip-installed executables (#2245)

Author: JoshMock

.ci/Dockerfile

@@ -7,6 +7,7 @@ ARG BUILDER_UID=1000
 ARG BUILDER_GID=1000
 ENV BUILDER_USER elastic
 ENV BUILDER_GROUP elastic
+ENV PATH="${PATH}:/var/lib/elastic/.local/bin"
 
 # Create user
 RUN groupadd --system -g ${BUILDER_GID} ${BUILDER_GROUP} \

.ci/run-repository.sh

@@ -26,14 +26,16 @@ echo -e "\033[1m>>>>> Build [elastic/elasticsearch-py container] >>>>>>>>>>>>>>>
 docker build \
        --file .ci/Dockerfile \
        --tag elastic/elasticsearch-py \
-       --build-arg PYTHON_VERSION=${PYTHON_VERSION} \
+       --build-arg "PYTHON_VERSION=${PYTHON_VERSION}" \
+       --build-arg "BUILDER_UID=$(id -u)" \
+       --build-arg "BUILDER_GID=$(id -g)" \
        .
 
 echo -e "\033[1m>>>>> Run [elastic/elasticsearch-py container] >>>>>>>>>>>>>>>>>>>>>>>>>>>>>\033[0m"
 
 mkdir -p junit
 docker run \
-  -u "$(id -u)" \
+  -u "$(id -u):$(id -g)" \
   --network=${network_name} \
   --env "STACK_VERSION=${STACK_VERSION}" \
   --env "ELASTICSEARCH_URL=${elasticsearch_url}" \