I have build a simple docker that write in loop the date on directory in host machine

Dockerfile:

FROM alpine:latest
RUN mkdir -p /tmp
RUN echo -e "#!/bin/shnwhile true; do date > /tmp/a; sleep 1; done" > /usr/local/bin/write_loop.sh
RUN chmod +x /usr/local/bin/write_loop.sh

ENTRYPOINT ["/usr/local/bin/write_loop.sh"]

Build :
docker build -t my_app --platform linux/arm64 - < Dockerfile

Run:
docker run --restart always -v /tmp:/tmp my_app

I want that docker will run a shell script at host machine (using /bin/sh at host machine)

How can I do that from the docker?