Implement database connection

db/.gitignore

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+secret.env

db/docker-compose.yml

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+# Use root/example as user/password credentials
+version: '3.1'
+
+services:
+  mongo:
+    image: mongo
+    restart: always
+    ports:
+      - 27017:27017
+    env_file:
+      - secret.env
+
+  mongo-express:
+    image: mongo-express
+    restart: always
+    ports:
+      - 8081:8081
+    env_file:
+      - secret.env

db/secret.env.example

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+MONGO_INITDB_ROOT_USERNAME="user"
+MONGO_INITDB_ROOT_PASSWORD="pass"
+ME_CONFIG_MONGODB_ADMINUSERNAME="user"
+ME_CONFIG_MONGODB_ADMINPASSWORD="pass"
+ME_CONFIG_MONGODB_URL="mongodb://user:pass@mongo:27017/"