Specify container names in docker-compose file

This is to prevent the service from relying on the default container naming behaviour of docker-compose.

docker-compose.yml

@@ -2,13 +2,15 @@ version: "3.9"
 services:
   mongo:
     image: "mongo:5.0.9"
+    container_name: taskmanagementservice_mongodb
     volumes:
       - .data/mongo:/data/db
   webapp:
     build: .
+    container_name: taskmanagementservice_api
     depends_on:
       - "mongo"
     environment:
-      - MongoDB_URI=mongodb://taskmanagementservice_mongo_1:27017
+      - MongoDB_URI=mongodb://taskmanagementservice_mongodb:27017
     ports:
       - "8080:8080"