Add the environment variables for database credentials.

src/main/blog/env.cljs

@@ -7,3 +7,13 @@
           (.-PORT))
       "3000"))
 
+(defn get-database-credentials
+  "Gets the postgres credentials. Defaults: host - postgres, port - 5432, database - postgres, user - postgres, password - 'changeme!!!'."
+  []
+  (let [env (.-env js/process)]
+    {:host (or (.-POSTGRES_HOST env) "postgres")
+     :port (or (.-POSTGRES_PORT env) 5432)
+     :database (or (.-POSTGRES_DATABASE env) "postgres")
+     :user (or (.-POSTGRES_USER env) "postgres")
+     :password (or (.-POSTGRES_PASSWORD env) "changeme!!!")}))
+