Merge branch 'log-to-stderr' into 'main'

set SHINY_LOG_STDERR=1

See merge request hub/rshiny-k8s!16

Dockerfile.python

@@ -3,6 +3,7 @@ FROM ${DOCKER_HUB_MIRROR}python:${PYTHON_VERSION}
 # define geographic location during installation
 ENV TZ=Etc/UTC
 ENV DEBIAN_FRONTEND=noninteractive
+ENV SHINY_LOG_STDERR=1
 
 EXPOSE 3838
 CMD ["shiny-server"]