Add mariadb-client for "mysqladmin" command

php7.3/Dockerfile

@@ -4,7 +4,7 @@ FROM debian:buster
 # see https://friendi.ca/resources/requirements/
 RUN set -ex; \
         apt-get update; \
-        DEBIAN_FRONTEND=noninteractive apt-get install -q -y wget gnupg2 apt-transport-https lsb-release ca-certificates; \
+        DEBIAN_FRONTEND=noninteractive apt-get install -q -y wget gnupg2 apt-transport-https lsb-release ca-certificates mariadb-client; \
         wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg; \
         echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list; \
         apt-get update; \

php7.4/Dockerfile

@@ -4,7 +4,7 @@ FROM debian:buster
 # see https://friendi.ca/resources/requirements/
 RUN set -ex; \
         apt-get update; \
-        DEBIAN_FRONTEND=noninteractive apt-get install -q -y wget gnupg2 apt-transport-https lsb-release ca-certificates; \
+        DEBIAN_FRONTEND=noninteractive apt-get install -q -y wget gnupg2 apt-transport-https lsb-release ca-certificates mariadb-client; \
         wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg; \
         echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list; \
         apt-get update; \

php8.0/Dockerfile

@@ -4,7 +4,7 @@ FROM debian:buster
 # see https://friendi.ca/resources/requirements/
 RUN set -ex; \
         apt-get update; \
-        DEBIAN_FRONTEND=noninteractive apt-get install -q -y wget gnupg2 apt-transport-https lsb-release ca-certificates; \
+        DEBIAN_FRONTEND=noninteractive apt-get install -q -y wget gnupg2 apt-transport-https lsb-release ca-certificates mariadb-client; \
         wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg; \
         echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list; \
         apt-get update; \