Make paths written to at runtime and secrets configurable via ENV variables

config/application.rb

@@ -35,6 +35,6 @@ module EntranceExam
     #
     # config.time_zone = "Central Time (US & Canada)"
     # config.eager_load_paths << Rails.root.join("extras")
-    config.entrance_exam_token = "password"
+    config.entrance_exam_token = ENV.fetch("RAILS_ENTRANCE_PASSWORD", "password")
   end
 end

config/database.yml

@@ -11,7 +11,7 @@ default: &default
 
 development:
   <<: *default
-  database: storage/development.sqlite3
+  database: <%= ENV.fetch("RAILS_DATABASE_PATH", "storage/development.sqlite3")
 
 # Warning: The database defined as "test" will be erased and
 # re-generated from your development database when you run "rake".

config/storage.yml

@@ -4,7 +4,7 @@ test:
 
 local:
   service: Disk
-  root: <%= Rails.root.join("storage") %>
+  root: <%= ENV.fetch("RAILS_STORAGE_PATH", Rails.root.join("storage")) %>
 
 # Use bin/rails credentials:edit to set the AWS secrets (as aws:access_key_id|secret_access_key)
 # amazon: