Use environment variable for the redis url in cable.yml

Move redis url from cable.yml to dotenv.example

INSTALL.md

@@ -105,6 +105,7 @@ There are a couple of environment variables you can set to configure OSEM. Check
 | CLOUDINARY_URL		| *string*			| Configure your cloudinary.com cloud name and api key/secret
 | STRIPE_PUBLISHABLE_KEY    | *string*          | Publishable Key for Stripe Gateway
 | STRIPE_SECRET_KEY    | *string*          | Secret Key for Stripe Gateway
+| OSEM_REDIS_URL | *string* | Redis server URL e.g. redis://localhost:6379/1
 
 ### Online Ticket Payments
 We use [Stripe](https://stripe.com) for accepting your ticket payments securely over the web.

config/cable.yml

@@ -6,4 +6,4 @@ test:
 
 production:
   adapter: redis
-  url: redis://localhost:6379/1
+  url: <%= ENV['OSEM_REDIS_URL'] %>

dotenv.example

@@ -70,3 +70,6 @@ OSEM_ICHAIN_ENABLED=false
 # ReCAPTCHA keys
 RECAPTCHA_SITE_KEY=""
 RECAPTCHA_SECRET_KEY=""
+
+# The url of the redis server
+OSEM_REDIS_URL='redis://localhost:6379/1'