feature: add example mysql nextcloud config

nextcloud/etc/my.cnf.d/nextcloud.cnf

@@ -0,0 +1,28 @@
+[server]
+skip_name_resolve = 1
+innodb_buffer_pool_size = 128M
+innodb_buffer_pool_instances = 1
+innodb_flush_log_at_trx_commit = 2
+innodb_log_buffer_size = 32M
+innodb_max_dirty_pages_pct = 90
+query_cache_type = 1
+query_cache_limit = 2M
+query_cache_min_res_unit = 2k
+query_cache_size = 64M
+tmp_table_size= 64M
+max_heap_table_size= 64M
+slow_query_log = 1
+slow_query_log_file = /var/log/mysql/slow.log
+long_query_time = 1
+
+[client]
+default-character-set = utf8mb4
+
+[mysqld]
+character_set_server = utf8mb4
+collation_server = utf8mb4_general_ci
+transaction_isolation = READ-COMMITTED
+binlog_format = ROW
+innodb_large_prefix=on
+innodb_file_format=barracuda
+innodb_file_per_table=1