MariaDB on Alpine Linux (armhf)

Dockerfile

FROM alpine:armhf
RUN apk update && apk add --no-cache mariadb mariadb-client
ADD setup.sh /setup.sh
RUN chmod a+x /setup.sh && ./setup.sh && rm -f /setup.sh
ENTRYPOINT ["mysqld_safe"]
EXPOSE 3306

setup.sh

#!/bin/sh
mysql_install_db --user=mysql
temp=`mktemp`
cat <<EOF > $temp
USE mysql;
FLUSH PRIVILEGES;
CREATE USER 'root'@'%';
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;
EOF
mysqld --user=mysql --bootstrap < $temp
rm -f $temp