prepared dockerfile and docker-compose for production deployment

Author: jschnapper

.env.example

@@ -3,10 +3,6 @@ export RAILS_ENV=production
 export NODE_ENV=production
 
 # TODO: Generate a secret
-# 1. generate `rails secret`
-# 2. add to the env variables SECRET_KEY_BASE and RAILS_MASTER_KEY
-# 3. run `rails credentials:edit --environment production` and enter the secret under `secret_key_base`
-# export SECRET_KEY_BASE=<SECRET KEY>
 # export RAILS_MASTER_KEY=<SECRET KEY>
 
 # TODO: choose one restart policy
@@ -33,4 +29,8 @@ export NODE_ENV=production
 
 # TODO: Add postgres user and password
 # export POSTGRES_USER=<POSTGRES USER>
-# export POSTGRES_PASSWORD=<POSTGRES PASSWORD>
+# export POSTGRES_PASSWORD=<POSTGRES PASSWORD>
+
+# serve static files since precompiled
+# export RAILS_SERVE_STATIC_FILES=true
+# export RAILS_LOG_TO_STDOUT=true