✨ feat(): add alpine mysql dockerfile

Signed-off-by: ehlxr <ehlxr.me@gmail.com>

alpine-mysql/Dockerfile

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+FROM alpine:latest
+LABEL maintainer="ehlxr.me@gmail.com"
+
+WORKDIR /app
+VOLUME /app
+
+RUN apk add --update --no-cache mysql mysql-client \
+    && rm -f /var/cache/apk/*
+
+COPY my.cnf /etc/mysql/my.cnf
+COPY startup.sh /startup.sh
+
+EXPOSE 3306
+CMD ["/startup.sh"]

alpine-mysql/README.md

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+# alpine-mysql
+a docker image base on alpine with mysql
+
+# build image
+```
+docker build -t ehlxr/alpine-mysql .
+docker run -it --rm -v $(pwd):/app -p 3306:3306 ehlxr/alpine-mysql
+```
+
+# Usage
+```
+docker run -it --name mysql -p 3306:3306 -v $(pwd):/app -e MYSQL_DATABASE=admin -e MYSQL_USER=tony -e MYSQL_PASSWORD=dpa\*12d -e MYSQL_ROOT_PASSWORD=111111 ehlxr/alpine-mysql
+```
+
+It will create a new db, and set mysql root password(default is 111111)

alpine-mysql/my.cnf

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+[mysqld]
+user = root
+datadir = /app/mysql
+port = 3306
+log-bin = /app/mysql/mysql-bin

alpine-mysql/startup.sh

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+#!/bin/sh
+
+if [ -d /app/mysql ]; then
+  echo "[i] MySQL directory already present, skipping creation"
+else
+  echo "[i] MySQL data directory not found, creating initial DBs"
+
+  mysql_install_db --user=root > /dev/null
+
+  if [ "$MYSQL_ROOT_PASSWORD" = "" ]; then
+    MYSQL_ROOT_PASSWORD=111111
+    echo "[i] MySQL root Password: $MYSQL_ROOT_PASSWORD"
+  fi
+
+  MYSQL_DATABASE=${MYSQL_DATABASE:-""}
+  MYSQL_USER=${MYSQL_USER:-""}
+  MYSQL_PASSWORD=${MYSQL_PASSWORD:-""}
+
+  if [ ! -d "/run/mysqld" ]; then
+    mkdir -p /run/mysqld
+  fi
+
+  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' 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=root --bootstrap --verbose=0 < $tfile
+  rm -f $tfile
+fi
+
+
+exec /usr/bin/mysqld --user=root --console