Allow to set the application timezone via secrets

This will allow us to keep using the timezone used when running
the installer.

We keep using Madrid as default timezone in the installer and in
the application.

config/application.rb

@@ -51,7 +51,7 @@ module Consul
 
     # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
     # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
-    config.time_zone = "Madrid"
+    config.time_zone = Rails.application.secrets.time_zone.presence || "Madrid"
 
     # The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
     # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]

config/secrets.yml.example

@@ -16,6 +16,7 @@ http_basic_auth: &http_basic_auth
   http_basic_auth: true
 
 development:
+  # time_zone: ""
   http_basic_username: "dev"
   http_basic_password: "pass"
   devise_lockable: false
@@ -31,12 +32,14 @@ development:
   <<: *maps
 
 test:
+  # time_zone: ""
   secret_key_base: 56792feef405a59b18ea7db57b4777e855103882b926413d4afdfb8c0ea8aa86ea6649da4e729c5f5ae324c0ab9338f789174cf48c544173bc18fdc3b14262e4
   <<: *maps
 
 staging:
   # secret_key_base: ""
   server_name: ""
+  # time_zone: ""
   # mailer_delivery_method: :smtp
   # smtp_settings:
   #   :address: "smtp.example.com"
@@ -81,6 +84,7 @@ staging:
 preproduction:
   # secret_key_base: ""
   server_name: ""
+  # time_zone: ""
   # mailer_delivery_method: :smtp
   # smtp_settings:
   #   :address: "smtp.example.com"
@@ -131,6 +135,7 @@ preproduction:
 production:
   # secret_key_base: ""
   server_name: ""
+  # time_zone: ""
   # mailer_delivery_method: :smtp
   # smtp_settings:
   #   :address: "smtp.example.com"