Rewrite MariaDB add-on (#1067)

* mariadb: Pin add-on to Alpine 3.11

* mariadb: Redirect MariaDB error log to add-on logs

* mariadb: Remove grant and host options

* mariadb: Add support for the mysql service

* mariadb: Use a more secure default on install

* mariadb: Skip DNS name resolving

* mariadb: Improve integrity checks and recovery

* mariadb: Small tweaks to shell scripts

* mariadb: Tune MariaDB for lower memory usage

* mariadb: Update documentation to match changes

* mariadb: Update changelog, bump version 2.0

* mariadb: Fix log ouput redirect for non-local builds

* Close port to world

* mariadb: Fix issue with user permissions

* mariadb: Ensure we are using a proper collation set

* mariadb: Add upgrade process for internal mariadb system tables

* mariadb: Change default username from hass to homeassistant

* mariadb: Update changelog

* mariadb: Update readme

Co-authored-by: Pascal Vizeli <pascal.vizeli@syshack.ch>

mariadb/data/mariadb-server.cnf

@@ -1,10 +1,40 @@
-
-[server]
-
 [mysqld]
+port=3306
+log_error=mariadb.err
 
+# Persistent storage location
 datadir=/data/databases
 
-[galera]
+# Use a proper collation set
+character-set-server = utf8mb4
+collation-server = utf8mb4_unicode_ci
 
-[mariadb]
+# Do not resolve DNS names
+skip-name-resolve
+
+# Tune for low-end devices (Like a Raspberry Pi)
+key_buffer_size = 16M
+max_connections = 64
+myisam_recover_options = FORCE
+myisam_sort_buffer_size = 8M
+net_buffer_length = 16K
+read_buffer_size = 256K
+read_rnd_buffer_size = 512K
+sort_buffer_size = 512K
+join_buffer_size = 128K
+table_open_cache = 64
+thread_cache_size = 8
+thread_stack = 192K
+tmp_table_size = 16M
+
+# Disable query cache
+query_cache_limit = 1M
+query_cache_size = 0M
+query_cache_type = 0
+
+# InnoDB Tweaks
+innodb_buffer_pool_instances = 1
+innodb_buffer_pool_size = 64M
+innodb_log_buffer_size = 8M
+innodb_log_file_size = 48M
+max_binlog_size = 96M