Create dummy password for prometheus to prevent cf-deploy failing
Create dummy password for prometheus to prevent cf-deploy failing

This bug means that when the job first runs there is no
'PLATFORM_PROMETHEUS_PASSWORD' to get. We seem to have been doing it manually
on the first run of new dev environments.

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf