fix: specify mysql platform to support Apple Silicon

specify the platform for the MySQL service as `linux/x86_64` to support
`docker-compose-without-neo4j.quickstart.yml` on Apple Silicon hardware.

Signed-off-by: Colton Padden <colton.padden@fastmail.com>

docker/quickstart/docker-compose-without-neo4j.quickstart.yml

@@ -137,6 +137,7 @@ services:
     - MYSQL_ROOT_PASSWORD=datahub
     hostname: mysql
     image: mysql:5.7
+    platform: linux/x86_64
     ports:
     - 3306:3306
     volumes: