Dockerfile

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+FROM harbor.ervine.dev/library/x86_64/alpine/alpine-3.11
+LABEL maintainer "Jonathan Ervine <docker@ervine.org>" architecture="x86_64" version="10.3.15-r0" date="05022020"
+
+RUN apk --no-cache --update add mariadb mariadb-client pwgen && \
+    rm -f /var/cache/apk/*
+
+ADD files/run.sh /scripts/run.sh
+RUN mkdir /scripts/pre-exec.d && \
+    mkdir /scripts/pre-init.d && \
+    chmod -R 755 /scripts
+
+EXPOSE 3306
+
+VOLUME ["/var/lib/mysql"]
+
+ENTRYPOINT ["/scripts/run.sh"]

Jenkinsfile

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+node("docker-node") {
+    docker.withRegistry('https://harbor.ervine.dev', 'jenkins-to-harbor') {
+    
+        git branch: "3.11.6", url: "ssh://git@git.ervine.org/jonny/x86_64-alpine-mariadb", credentialsId: 'jenkins-to-git'
+    
+        sh "git rev-parse HEAD > .git/commit-id"
+        def commit_id = readFile('.git/commit-id').trim()
+        println commit_id
+
+        try {    
+            stage "build"
+            def app = docker.build "library/x86_64/alpine/mariadb"
+    
+            stage "publish"
+            app.push("${env.BUILD_NUMBER}")
+            app.push("latest")
+
+            stage('Deploy on K8s'){
+                sh "/usr/local/bin/kubectl -n db delete po mariadb-0"
+            }
+        }
+        catch (err) {
+            currentBuild.result = 'FAILURE'
+        }
+    }
+}

files/run.sh

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+#!/bin/sh 
+# execute any pre-init scripts
+for i in /scripts/pre-init.d/*sh
+do
+        if [ -e "${i}" ]; then
+                echo "[i] pre-init.d - processing $i"
+                . "${i}"
+        fi
+done
+
+if [ -d "/run/mysqld" ]; then
+        echo "[i] mysqld already present, skipping creation"
+        chown -R mysql:mysql /run/mysqld
+else
+        echo "[i] mysqld not found, creating...."
+        mkdir -p /run/mysqld
+        chown -R mysql:mysql /run/mysqld
+fi
+
+if [ -d /var/lib/mysql/mysql ]; then
+        echo "[i] MySQL directory already present, skipping creation"
+        chown -R mysql:mysql /var/lib/mysql
+else
+        echo "[i] MySQL data directory not found, creating initial DBs"
+	mkdir -p /var/lib/mysql
+        chown -R mysql:mysql /var/lib/mysql
+
+        mysql_install_db --user=mysql --datadir=/var/lib/mysql > /dev/null
+
+        if [ "$MYSQL_ROOT_PASSWORD" = "" ]; then
+                MYSQL_ROOT_PASSWORD=`pwgen 16 1`
+                echo "[i] MySQL root Password: $MYSQL_ROOT_PASSWORD"
+        fi
+
+        MYSQL_DATABASE=${MYSQL_DATABASE:-""}
+        MYSQL_USER=${MYSQL_USER:-""}
+        MYSQL_PASSWORD=${MYSQL_PASSWORD:-""}
+
+        tfile=`mktemp`
+        if [ ! -f "$tfile" ]; then
+            return 1
+        fi
+
+        cat << EOF > $tfile
+USE mysql;
+FLUSH PRIVILEGES;
+GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' identified by '$MYSQL_ROOT_PASSWORD' WITH GRANT OPTION;
+GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' identified by '$MYSQL_ROOT_PASSWORD' WITH GRANT OPTION;
+UPDATE user SET password=PASSWORD("") WHERE user='root' AND host='localhost';
+EOF
+
+        if [ "$MYSQL_DATABASE" != "" ]; then
+            echo "[i] Creating database: $MYSQL_DATABASE"
+            echo "CREATE DATABASE IF NOT EXISTS \`$MYSQL_DATABASE\` CHARACTER SET utf8 COLLATE utf8_general_ci;" >> $tfile
+
+            if [ "$MYSQL_USER" != "" ]; then
+                echo "[i] Creating user: $MYSQL_USER with password $MYSQL_PASSWORD"
+                echo "GRANT ALL ON \`$MYSQL_DATABASE\`.* to '$MYSQL_USER'@'%' IDENTIFIED BY '$MYSQL_PASSWORD';" >> $tfile
+            fi
+        fi
+
+        /usr/bin/mysqld --user=mysql --bootstrap --verbose=0 < $tfile
+        rm -f $tfile
+fi
+
+# execute any pre-exec scripts
+for i in /scripts/pre-exec.d/*sh
+do
+        if [ -e "${i}" ]; then
+                echo "[i] pre-exec.d - processing $i"
+                . ${i}
+        fi
+done
+
+exec /usr/bin/mysqld --user=mysql --console