Add mongodb container service for dev/tests

docker-compose.yml

@@ -1,6 +1,11 @@
 version: '2'
 
 services:
+  mdb:
+    image: mongo
+    ports:
+      - "27017"
+
   rdb:
     image: rethinkdb
     ports:
@@ -30,8 +35,30 @@ services:
       - ./tox.ini:/usr/src/app/tox.ini
       - ./Makefile:/usr/src/app/Makefile
     environment:
+      BIGCHAINDB_DATABASE_BACKEND: rethinkdb
       BIGCHAINDB_DATABASE_HOST: rdb
       BIGCHAINDB_SERVER_BIND: 0.0.0.0:9984
     ports:
       - "9984"
     command: bigchaindb start
+  
+  bdb-mdb:
+    build:
+      context: .
+      dockerfile: Dockerfile-dev
+    volumes:
+      - ./bigchaindb:/usr/src/app/bigchaindb
+      - ./tests:/usr/src/app/tests
+      - ./docs:/usr/src/app/docs
+      - ./setup.py:/usr/src/app/setup.py
+      - ./setup.cfg:/usr/src/app/setup.cfg
+      - ./pytest.ini:/usr/src/app/pytest.ini
+      - ./tox.ini:/usr/src/app/tox.ini
+    environment:
+      BIGCHAINDB_DATABASE_BACKEND: mongodb
+      BIGCHAINDB_DATABASE_HOST: mdb
+      BIGCHAINDB_DATABASE_PORT: 27017
+      BIGCHAINDB_SERVER_BIND: 0.0.0.0:9984
+    ports:
+      - "9984"
+    command: bigchaindb start