Check if mysql has been initialized before trying to upgrade

data/Dockerfiles/mariadb/Dockerfile

@@ -7,7 +7,6 @@ RUN apt-get update && \
   apt-get install -y --no-install-recommends \
     python3 \
     python3-pip \
-    gosu \
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/*
 

data/Dockerfiles/mariadb/docker-entrypoint.sh

@@ -17,4 +17,4 @@ if [ $BOOTSTRAP_EXIT_CODE -ne 0 ]; then
 fi
 
 echo "Bootstrap succeeded. Starting MariaDB..."
-exec gosu mysql "$@"
+exec /usr/local/bin/docker-entrypoint.sh "$@"