fix: install build-essential for agent

CHANGELOG.md

@@ -5,6 +5,7 @@ Which is based on [Keep A Changelog](http://keepachangelog.com/)
 
 ## [Unreleased]
 - fix: install python-requests for backend
+- fix: install build-essential for agent
 
 ## [1.0.0] - 2019-02-06
 - first version

tasks/agent.yml

@@ -6,6 +6,7 @@
     packages:
       - sensu-go-agent
       - sensu-plugins-ruby
+      - build-essential
       - monitoring-plugins-basic
   register: result
   retries: 3

test/integration/default/serverspec/default_spec.rb

@@ -11,6 +11,7 @@ puts '================================'
   sensu-go-agent
   sensu-go-cli
   sensu-go-backend
+  build-essential
   monitoring-plugins-basic
   python-requests
 ].each do |package|