Use user nobody in Dockerfile
Use user nobody in Dockerfile

Signed-off-by: Goutham Veeramachaneni <caf616f34019d2c106581c18639c41d1bae35076@iith.ac.in>

Gouthamve/prometheus,prometheus/prometheus,kangwoo/prometheus,brancz/prometheus,Gouthamve/prometheus,AlekSi/prometheus,amorken/prometheus,Stackdriver/stackdriver-prometheus,AlekSi/prometheus,prometheus/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus,amorken/prometheus,AlekSi/prometheus,Conorbro/prometheus,GoogleCloudPlatform/prometheus,kangwoo/prometheus,brancz/prometheus,Gouthamve/prometheus,brancz/prometheus,Stackdriver/stackdriver-prometheus,alileza/prometheus,yanghongkjxy/prometheus,alileza/prometheus,yanghongkjxy/prometheus,yanghongkjxy/prometheus,Stackdriver/stackdriver-prometheus,Conorbro/prometheus,prometheus/prometheus,Gouthamve/prometheus,AlekSi/prometheus,prometheus/prometheus,keegancsmith/prometheus,GoogleCloudPlatform/prometheus,brancz/prometheus,Conorbro/prometheus,GoogleCloudPlatform/prometheus,kangwoo/prometheus,amorken/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,alileza/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,prometheus/prometheus,GoogleCloudPlatform/prometheus,yanghongkjxy/prometheus,Conorbro/prometheus,Stackdriver/stackdriver-prometheus,amorken/prometheus,kangwoo/prometheus