Add mongo image to docker-compose

.gitignore

+# Docker Output
+/mongo

backend-services/feed-service/app/models/MongoDBClient.scala

 package models
 
-import com.typesafe.config.ConfigFactory
+import com.typesafe.config.{Config, ConfigFactory}
 
 import org.mongodb.scala.{MongoClient, MongoDatabase, MongoCollection, Document, FindObservable, Observer, Observable}
 import org.mongodb.scala.model.{Filters, Projections, Sorts}
@@ -18,7 +18,11 @@ import scala.util.{Success, Failure, Try}
  */
 class MongoDBClient {
     // Loads the default configuration
-    private val config = ConfigFactory.load()
+    private val applicationConfig: Config = ConfigFactory.load("application.conf")
+    private val referenceConfig: Config = ConfigFactory.parseResources("reference.conf")
+    private val config: Config = referenceConfig.withFallback(applicationConfig).resolve()
+
+    private val mongoUri = config.getString("mongodb.uri")
 
     // Connects to a MongoDB Client when class is constructed
     private var client: MongoClient = this.connect()
@@ -29,7 +33,7 @@ class MongoDBClient {
      * @return A MongoClient instance.
      */
     def connect(): MongoClient = {
-        MongoClient(config.getString("mongo.default.url"))
+        MongoClient(mongoUri)
     }
 
     /**

backend-services/feed-service/conf/application.conf

+# Default Configuration File
+
 # MongoDB Connection Strings
-mongo.default.url="mongodb://localhost:27017/"
+mongodb.uri = "mongodb://localhost:27017/"

backend-services/feed-service/conf/reference.conf

+# Configuration File to be replaced with environment variables, if present
+
+# MongoDB Connection Strings
+mongodb.uri = ${?MONGO_URI}

docker-compose.yml

@@ -7,3 +7,12 @@ services:
     restart: unless-stopped
     ports: 
      - "9001:9000"
+    environment:
+     - MONGO_URI=mongodb://feed-mongo:27017/
+
+  mongo:
+      image: mongo
+      container_name: feed-mongo
+      ports:
+       - "27017:27017"
+     
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