Make the prometheus config file ignored by git

.gitignore

@@ -38,7 +38,6 @@ awx/ui/build
 awx/ui/.env.local
 awx/ui/instrumented
 rsyslog.pid
-tools/prometheus
 tools/docker-compose/ansible/awx_dump.sql
 tools/docker-compose/Dockerfile
 tools/docker-compose/_build
@@ -154,6 +153,9 @@ use_dev_supervisor.txt
 /sanity/
 /awx_collection_build/
 
+# Setup for metrics gathering
+tools/prometheus/prometheus.yml
+
 .idea/*
 *.unison.tmp
 *.#