correctly derive paths for UploadedFileUploader

`UploadedFileUploader`'s path generation was extremely fragile. for instance, it
would generate an incorrect path if the configuration option didn't end with
'/'.

to generate a vaild in a system independent way, use `Pathname#/` and then cast
back to a string.

app/uploaders/hyrax/uploaded_file_uploader.rb

@@ -4,21 +4,21 @@ class UploadedFileUploader < CarrierWave::Uploader::Base
     # Override the directory where uploaded files will be stored.
     # This is a sensible default for uploaders that are meant to be mounted:
     def store_dir
-      configured_upload_path + "#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
+      (configured_upload_path / model.class.to_s.underscore / mounted_as} / model.id).to_s
     end
 
     def cache_dir
-      configured_cache_path + "#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
+      (configured_cache_path / model.class.to_s.underscore / mounted_as / model.id).to_s
     end
 
     private
 
     def configured_upload_path
-      Hyrax.config.upload_path.call
+      Pathname.new(Hyrax.config.upload_path.call)
     end
 
     def configured_cache_path
-      Hyrax.config.cache_path.call
+      Pathname.new(Hyrax.config.cache_path.call)
     end
   end
 end

chart/hyrax/templates/configmap-env.yaml

@@ -14,12 +14,10 @@ data:
   {{- if .Values.memcached.enabled }}
   MEMCACHED_HOST: {{ template "hyrax.memcached.fullname" . }}
   {{- end }}
-  {{- if .Values.derivativesVolume.enabled }}
   HYRAX_BRANDING_PATH: "/app/samvera/branding"
   HYRAX_DERIVATIVES_PATH: "/app/samvera/derivatives"
-  HYRAX_CACHE_PATH: "/app/samvera/file_cache"
+  HYRAX_CACHE_PATH: "/app/samvera/file_cache/"
   HYRAX_UPLOAD_PATH: "/app/samvera/uploads"
-  {{- end }}
   RACK_ENV: production
   RAILS_ENV: production
   {{- if .Values.redis.enabled }}