[UBI] Copy license to /licenses folder

Requirement for OpenShift certification

https://redhat-connect.gitbook.io/partner-guide-for-red-hat-openshift-and-container/program-on-boarding/technical-prerequisites#licenses-requirements

Signed-off-by: Tyler Smalley <tyler.smalley@elastic.co>

src/dev/build/tasks/os_packages/docker_generator/templates/Dockerfile

@@ -85,7 +85,6 @@ RUN groupadd --gid 1000 kibana && \
  useradd --uid 1000 --gid 1000 \
  --home-dir /usr/share/kibana --no-create-home \
  kibana
-USER kibana
 
 LABEL org.label-schema.build-date="{{dockerBuildDate}}" \
  org.label-schema.license="{{license}}" \
@@ -115,8 +114,13 @@ LABEL name="Kibana" \
  release="1" \
  summary="Kibana" \
  description="Your window into the Elastic Stack."
+
+RUN mkdir /licenses && \
+ cp LICENSE.txt /licenses/LICENSE
 {{/ubi}}
 
+USER kibana
+
 ENTRYPOINT ["/usr/local/bin/dumb-init", "--"]
 
 CMD ["/usr/local/bin/kibana-docker"]