Add example (commented) config for an AWSS3 bucket

example_config.yaml

@@ -42,4 +42,8 @@ ThinPosterior:  # Post-process further chain thinning HDF5 -> .pkl.
 
 Geopackage:  # covid.tasks.summary_geopackage
   base_geopackage: data/UK2019mod_pop.gpkg
-  base_layer: UK2019mod_pop_xgen
\ No newline at end of file
+  base_layer: UK2019mod_pop_xgen
+
+#AWSS3:
+#  bucket: mybucket
+#  profile: myprofile