Use tmpfs to mount MySQL data.

This approach to speed up database tests was suggested by https://www.fusonic.net/en/blog/fusonic-test-with-databases-part-3.

Signed-off-by: Bradley Grainger <[email protected]>

.ci/docker-run.sh

@@ -40,6 +40,7 @@ docker run -d \
 	-p $PORT:3306 \
 	--name mysql \
 	-e MYSQL_ROOT_PASSWORD='test' \
+	--tmpfs /var/lib/mysql \
 	$IMAGE \
   --log-bin-trust-function-creators=1 \
   --local-infile=1 \

tests/README.md

@@ -7,7 +7,7 @@ with Connector/NET and that [known bugs have been fixed](https://mysqlconnector.
 
 The tests require a MySQL server. The simplest way to run one is with [Docker](https://www.docker.com/community-edition):
 
-    docker run -d --rm --name mysqlconnector -e MYSQL_ROOT_PASSWORD=pass -p 3306:3306 mysql:8.0.27 --max-allowed-packet=96M --character-set-server=utf8mb4 --log-bin-trust-function-creators=1 --local-infile=1 --max-connections=250
+    docker run -d --rm --name mysqlconnector -e MYSQL_ROOT_PASSWORD=pass -p 3306:3306 --tmpfs /var/lib/mysql mysql:8.0 --max-allowed-packet=96M --character-set-server=utf8mb4 --log-bin-trust-function-creators=1 --local-infile=1 --max-connections=250
 
 Copy the file `SideBySide/config.json.example` to `SideBySide/config.json`, then edit
 the `config.json` file in order to connect to your server. If you are using the Docker