Support new relic

[wilcorrea]

Hey guys, suggestions to add support to new relic to the image?

I am using webdevops/php-nginx and I wanna install the agent. There is instructions on doc but doesn look a good way.

https://docs.newrelic.com/docs/apm/agents/php-agent/installation/php-agent-installation-ubuntu-debian/#use-apt

They have another link that looks interesting to add on image

https://docs.newrelic.com/docs/apm/agents/php-agent/advanced-installation/docker-other-container-environments-install-php-agent/