Correctly set MySQL to use utf8 on ubuntu

utf8mb4.cnf

[client]
default-character-set = utf8mb4

[mysql]
default-character-set = utf8mb4

[mysqld]
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci

# Increase performance
innodb_file_format=barracuda
innodb_file_format_max=barracuda
innodb_file_per_table=1
innodb_large_prefix=1

# Enable for space/memory saving for large tables
#innodb_default_row_format=COMPRESSED

# New default for tables MySQL 5.7+ / MariaDB 10.2+
#innodb_default_row_format=DYNAMIC

Ubuntu 20.04+ (MariaDB 10.3+) seems to finally default to unicode support:

MariaDB [mysql]> SHOW VARIABLES LIKE 'character\_set\_%';
+--------------------------+---------+
| Variable_name            | Value   |
+--------------------------+---------+
| character_set_client     | utf8mb4 |
| character_set_connection | utf8mb4 |
| character_set_database   | utf8mb4 |
| character_set_filesystem | binary  |
| character_set_results    | utf8mb4 |
| character_set_server     | utf8mb4 |
| character_set_system     | utf8    |
+--------------------------+---------+
7 rows in set (0.001 sec)