test: modify dockerfile to test environment variables (openedx#33629)

Dockerfile

@@ -153,10 +153,14 @@ FROM base as production
 USER app
 
 ENV EDX_PLATFORM_SETTINGS='docker-production'
-ENV SERVICE_VARIANT "${SERVICE_VARIANT}"
-ENV SERVICE_PORT "${SERVICE_PORT}"
+ENV SERVICE_VARIANT="${SERVICE_VARIANT}"
+ENV SERVICE_PORT="${SERVICE_PORT}"
 ENV DJANGO_SETTINGS_MODULE="${SERVICE_VARIANT}.envs.$EDX_PLATFORM_SETTINGS"
 EXPOSE ${SERVICE_PORT}
+
+RUN echo "${SERVICE_VARIANT}"
+RUN echo "${DJANGO_SETTINGS_MODULE}"
+
 CMD gunicorn \
     -c /edx/app/edxapp/edx-platform/${SERVICE_VARIANT}/docker_${SERVICE_VARIANT}_gunicorn.py \
     --name ${SERVICE_VARIANT} \
@@ -187,6 +191,6 @@ RUN ln -s "$(pwd)/cms/envs/devstack-experimental.yml" "/edx/etc/studio.yml"
 RUN touch ../edxapp_env
 
 ENV EDX_PLATFORM_SETTINGS='devstack_docker'
-ENV SERVICE_VARIANT "${SERVICE_VARIANT}"
+ENV SERVICE_VARIANT="${SERVICE_VARIANT}"
 EXPOSE ${SERVICE_PORT}
 CMD ./manage.py ${SERVICE_VARIANT} runserver 0.0.0.0:${SERVICE_PORT}