docs: instruction on creating dummy awsconfig
docs: instruction on creating dummy awsconfig

To be able to build the docs an awsconfig file must exist for the Dockerfile to copy. This adds an instruction to create an empty, dummy file so that the build will work.
grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana