Set hostname for testdb containers.

Author: fukamachi

docker-compose.yml

@@ -15,25 +15,25 @@ services:
       - postgres
       - mysql
     environment:
-      POSTGRES_HOST: postgres
+      POSTGRES_HOST: mito-test-postgres
       POSTGRES_USER: mito
       POSTGRES_PASS: mito
-      MYSQL_HOST: mysql
+      MYSQL_HOST: mito-test-mysql
       MYSQL_USER: root
       MYSQL_PASS: mito
 
   postgres:
     container_name: mito-postgres
+    hostname: mito-test-postgres
     image: "postgres:10"
-    restart: always
     environment:
       POSTGRES_USER: mito
       POSTGRES_PASSWORD: mito
 
   mysql:
     container_name: mito-mysql
+    hostname: mito-test-mysql
     image: "mysql:8"
     command: --default-authentication-plugin=mysql_native_password
-    restart: always
     environment:
       MYSQL_ROOT_PASSWORD: mito