Create cache volume to save getpdf results between sessions.

erb/docker-compose-enote.yml.erb

@@ -138,6 +138,7 @@ services:
       - <%= @data_root %>/content:/content
       - <%= @log_root %>/getpdf:/getpdf-server/log
       - <%= @data_root %>/sharelatex-data/:/sharelatex
+      - getpdf_cache:/cache
     environment:
       TIMEZONE_CITY: '<%= timezone_city %>'
       TZ: '<%= timezone %>'
@@ -274,3 +275,5 @@ services:
 <% for container in (expected_containers.reject{|x| x.eql? 'enote-proxy' }) %>
       - <%= container %><% end %>
 
+volumes:
+  getpdf_cache:

lib/docker_compose_helpers.rb

@@ -34,6 +34,8 @@ module DockerComposeHelpers
 
           to, from = volume_binding.split(':')
 
+          next unless to.starts_with? '/' # i.e. not a named volume
+
           exist = yield to
           unless exist
             missing = true

lib/enote_config.rb

@@ -28,7 +28,6 @@ module EnoteConfig
   attr_accessor :docker_machine
   attr_accessor :timezone
 
-
   default_enabled_features = {
     :redis => true,
     :revproxy => true,