Docker container immediatly stopping after use of docker run

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As the title says I have a problem regarding one of my dockerfile, indeed once the image is built it immediately stops after being run with the docker run command, my dockerfile base image is alpine:3.18 and I run mariadb inside the container. Here is the dockerfile:

FROM alpine:3.18

ARG APP_USER=mysql

RUN apk update && apk add --no-cache mariadb mariadb-client

RUN mkdir -p /var/log/${APP_USER}

RUN mkdir -p /var/run/mysqld && \
    chown -R ${APP_USER}:${APP_USER} /var/run/mysqld && \
    chmod -R 750 /var/run/mysqld

RUN mkdir -p /var/lib/${APP_USER} && \
    chown -R ${APP_USER}:${APP_USER} /var/lib/${APP_USER} && \
    chmod -R 750 /var/lib/${APP_USER} && \
    mkdir -p /var/run/${APP_USER} && \
    chown -R ${APP_USER}:${APP_USER} /var/run/${APP_USER} && \
    chmod -R 750 /var/run/${APP_USER} && \
    chown -R ${APP_USER}:${APP_USER} /var/log/${APP_USER} && \
    chmod -R 750 /var/log/${APP_USER}

COPY ./conf/my.cnf /etc/${APP_USER}/my.cnf

COPY ./tools/init.sql /docker-entrypoint-initdb.d/init.sql

EXPOSE 3306

USER ${APP_USER}:${APP_USER}

CMD ["mysqld_safe"]

here is the my.cnf file:

[mysqld]
datadir=/var/lib/mysql
socket=/var/run/mysqld/mysqld.sock

log-error=/var/log/mysql/error.log

# Security
skip-networking

here is the script that will create an admin user and set a password for root user.

CREATE USER ${ADMIN_USERNAME}@'localhost' IDENTIFIED BY ${ADMIN_PASSWORD};
GRANT ALL PRIVILEGES ON ${MARIADB_DB_NAME}.* TO ${ADMIN_USERNAME}@'localhost' IDENTIFIED BY ${ADMIN_PASSWORD};
ALTER USER 'root'@'localhost' IDENTIFIED BY ${ROOT_PASSWORD};
FLUSH PRIVILEGES;

CREATE DATABASE wordpress;

I checked the exit status of my container, and the status is 0 it seems that all is ok but my container stops immediately when started using docker run command.