docker compose run commands on the containers without a dockerfile - docker

Question

I am wondering if its possible to install dependancies in the containers without creating aditional dockerfiles.
Basic example is php apache + mysqli.
For mysqli I need to run:
docker-php-ext-install mysqli && apachectl restart
But I dont want to create a seperate file just to run this command.
I have tried adding it as a command to the docker-compose.yml:
services:
apache-php:
image: php:8.1-apache
volumes:
- ./:/var/www/html
command: docker-php-ext-install mysqli && apachectl restart
ports:
- "5520:80"
The commands succesfully execute but then the container shuts down.
As soon as I add any command even if its echo "hello" the container will shutdown.
Ive read so much of the documentation and I cant see a clear reason for this or hunt down any way to make the container stay open.
Ive read a lot of stack overflows on using sleep, tty interactive and other tricks to keep the container from shutting down but none of them work.
I can acheive a single file setup with simple bash script using docker cli:
#!/usr/bin/env bash
#Use the project folder as the prefix for our containers and networks.
PROJECT=`basename $(pwd)`
# HTTP: APACHE + PHP + MYSQLI
NAME="${PROJECT}_http"
PORT="5520"
docker run -dit --name "$NAME" -p $PORT:80 \
-v `pwd`:/var/www/html \
php:8.1-apache
docker exec "$NAME" docker-php-ext-install mysqli
docker exec "$NAME" apachectl restart
This script works fine, and I can also do anything I want (create networks aliases etc) with docker cli but docker-compose would be nicer.
I just dont want to create a bunch of extra files for some simple commands to run. Surely there is a way?
If its not possible I guess I just keep expanding the bash script and build my network that way.