(maint) Container test with a puppetserver

 - Introduce a new test that spins up a puppetserver and connects an
   agent

   The agent waits for 30s before trying to connect to the server, then
   tries to connect 5 times with a 5s delay

docker-compose.yml

@@ -9,3 +9,15 @@ services:
     image: ${PUPPET_AGENT_IMAGE:-puppet/puppet-agent-ubuntu}
     entrypoint: 'facter'
     command: 'is_virtual'
+
+  puppet:
+    environment:
+      # overrides default shared service definition
+      - USE_PUPPETDB=false
+
+  agent-run:
+    hostname: agent-run
+    image: ${PUPPET_AGENT_IMAGE:-puppet/puppet-agent-ubuntu}
+    entrypoint: '/bin/bash'
+    # give server a 30s start buffer, then try agent runs for 15s before exiting
+    command: "-c 'sleep 30; i=0; while ! /opt/puppetlabs/bin/puppet agent --verbose --onetime --no-daemonize --summarize --server puppet --certname agent-run --masterport 8140 --ca_server puppet --ca_port 8140 --waitforcert 180; do sleep 5; i=$$((i+1)); if [ $$i -gt 5 ]; then exit 1; fi; done;'"

spec/dockerfile_spec.rb

@@ -7,9 +7,8 @@
 RSpec.configure do |c|
   c.before(:suite) do
     ENV['PUPPET_AGENT_IMAGE'] = require_test_image
-    pull_images(['agent-apply', 'agent-facter'])
+    pull_images(['agent_apply', 'agent_facter', 'agent-run'])
     teardown_cluster
-    # no certs to preload, but if the suite adds puppetserver, be explicit
     docker_compose_up(preload_certs: false)
   end
 
@@ -23,6 +22,7 @@
   {
     'agent-apply': 'be able to run a puppet apply',
     'agent-facter': 'be able to run facter',
+    'agent-run': 'be able to run against a server'
   }.each do |container, op|
     it "should #{op}" do
       container = get_service_container(container)