Add configurable asset caching for Docker on Windows environments

config/initializers/assets.rb

@@ -1,5 +1,13 @@
 # Be sure to restart your server when you modify this file.
 
+Rails.application.config.assets.configure do |env|
+  env.cache = Sprockets::Cache::FileStore.new(
+    ENV.fetch("SPROCKETS_CACHE", "#{env.root}/tmp/cache/assets"),
+    Rails.application.config.assets.cache_limit,
+    env.logger
+  )
+end
+
 # Version of your assets, change this if you want to expire all your assets.
 Rails.application.config.assets.version = '1.0'
 

docker-compose.yml

@@ -10,9 +10,11 @@ services:
     links:
       - postgres
       - redis
+    environment:
+      - SPROCKETS_CACHE=/cache
     volumes:
       - ./:/app
-      - cache:/app/tmp/cache
+      - cache:/cache
     ports:
       - 3000:3000