example docker compose for postgresql with db init script

docker-compose.yml

postgres:
  image: postgres:9.4
  volumes:
    - ./init.sql:/docker-entrypoint-initdb.d/init.sql

init.sql

create table sometable(id int);

I know its maybe out of topic but asking out of cough cough despair, did anyone find a way to do something like this with an oracle database? "docker-entrypoint-initdb.d" doesn't seem to work for oracle... but worked perfectly when I tried with postgres

It depends on docker image you're using if it is supporting entry scripts and how. For postgres docker image it's you can see execution here:

• https://github.com/docker-library/postgres/blob/master/docker-entrypoint.sh#L332ff

For your image you need to check the documentation of source code if it's available.