Use cheaper auth plugin and skip binlog for test MySQL containers

Switch the dockerized MySQL container to mysql_native_password (single
challenge-response) instead of the default caching_sha2_password
(extra RSA key exchange round-trip on non-TLS connections). Also
disable binary logging since tests don't need replication. Both
reduce per-connection overhead.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Fredrik Adelöw <freben@gmail.com>

packages/backend-test-utils/src/database/mysql.ts

@@ -56,6 +56,10 @@ export async function startMysqlContainer(image: string): Promise<{
     .withExposedPorts(3306)
     .withEnvironment({ MYSQL_ROOT_PASSWORD: password })
     .withTmpFs({ '/var/lib/mysql': 'rw' })
+    .withCommand([
+      '--default-authentication-plugin=mysql_native_password',
+      '--skip-log-bin',
+    ])
     .start();
 
   const host = container.getHost();