FROM mysql as builder
COPY *.sql /somefolder
COPY buildscript.sh /buildscript.sh

FROM mysql
COPY --from build /var/lib/mysql /data # to avoid using the volume folder

FROM mysql:5.7.23 as prep
COPY *.sql /docker-entrypoint-initdb.d/
COPY scripts/build-db.sh /
ARG MYSQL_ROOT_PASSWORD=my-very-secret
ARG MYSQL_USER=sampleuser
ARG MYSQL_PASSWORD=password123
RUN chmod u+x /build-db.sh
RUN /build-db.sh

FROM mysql:5.7.23
# use /data in my case so that it uses a directory that is not a VOLUME
COPY --from=prep /var/lib/mysql /data

#!/bin/bash
head -n -1 /usr/local/bin/docker-entrypoint.sh > /d2.sh
chmod +x /d2.sh
exec /d2.sh