Changes to Prometheus

[mcmikemn]

Fixed #254 Fixing #253

[mcmikemn]

@EnigmaCurry, this works insofar as it seems to correctly format the comma-separated list of targets from the .env file into the correct syntax to be templated into prometheus.yml. I can shell into the Prometheus container and cat /etc/prometheus/prometheus.yml and the values are there.

However, Prometheus isn't activating those targets - they're not available in the UI. In the past, I had manually edited /etc/prometheus/prometheus.yml to add these targets, and Prometheus recognized them. Now that d.ry is automatically adding them, Prometheus isn't recognizing them. I'm not sure why.