Reduce InnoDB change buffer size for read-heavy BI workload

Set innodb_change_buffer_max_size=10 (down from default 25%) to free
buffer pool space for data page caching. Superset's read-heavy
workload benefits more from data caching than deferred index updates.

Closes #72

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: szachovy

CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Completed [ARCHITECTURE.md](./docs/ARCHITECTURE.md) (#93)
 * Migrated CI from self-hosted to GitHub-hosted runners with Docker-in-Docker test infrastructure. (#94)
 * Test workflow always builds service images locally for reproducibility. (#97)
+* Reduced InnoDB change buffer size for read-heavy BI workload. (#72)
 
 ### Fixed
 

services/mysql-server/mysql_config.cnf.tpl

@@ -14,3 +14,4 @@ ssl-key = "/etc/mysql/ssl/mysql_server_key.pem"
 require_secure_transport = "ON"
 max_connections = "50"
 max_connect_errors = "50"
+innodb_change_buffer_max_size = "10"