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