CI: More MySQL testing

.github/workflows/github_action_test_suite.yml

@@ -71,7 +71,10 @@ jobs:
           --health-interval=10s
           --health-timeout=5s
           --health-retries=3
-          --mount type=bind,source=${{ github.workspace }}/.github/workflows/mysql.cnf,target=/etc/mysql/conf.d/custom.cnf,readonly
+          --entrypoint=""
+          sh
+          -c
+          "printf '[mysqld]\ncharacter-set-server=utf8mb4\ncollation-server=utf8mb4_unicode_ci\ninnodb-default-row-format=DYNAMIC\n' > /etc/mysql/conf.d/custom.cnf && exec docker-entrypoint.sh mysqld"
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/mysql.cnf

@@ -1,5 +0,0 @@
-[mysqld]
-character-set-server=utf8mb4
-collation-server=utf8mb4_unicode_ci
-innodb-default-row-format=DYNAMIC
-