update code

laradock/mysql/Dockerfile

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+ARG MYSQL_VERSION
+FROM mysql:${MYSQL_VERSION}
+
+LABEL maintainer="Mahmoud Zalt <mahmoud@zalt.me>"
+
+#####################################
+# Set Timezone
+#####################################
+
+ARG TZ=UTC
+ENV TZ ${TZ}
+RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone && chown -R mysql:root /var/lib/mysql/
+
+COPY my.cnf /etc/mysql/conf.d/my.cnf
+
+RUN chmod 0444 /etc/mysql/conf.d/my.cnf
+
+CMD ["mysqld"]
+
+EXPOSE 3306