How to fix file permissions on wp-content with official wordpress image for docker-compose

Question

Problem

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I'm setting up a Wordpress local environment with docker-compose and the official wordpress image from the docker repository.

I am on windows.

The problem is that I have some premissions issues on the wp-content, and I am not able to upload files from my Wordpress admin panel.

What I've already done

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I checked then the file permissions inside the container, and this was the output:

As you can see, the owner of my wp-content is root instead of www-data.

The immediate solution is to open the container's bash and give
chown -R www-data:www-data /var/www/html/wp-content/

This of course works, but I don't want to do this process every time I start a new wordpress project. To achieve this I've created a Dockerfile like this:

FROM wordpress:5.1.1  # install dos2unix (fix problem between CRLF and LF) RUN apt-get update RUN apt-get install -y dos2unix  # increase upload limit RUN touch /usr/local/etc/php/conf.d/uploads.ini \     && echo "upload_max_filesize = 10M;" >> /usr/local/etc/php/conf.d/uploads.ini  # fix permissions issues COPY entrypoint.sh / RUN dos2unix /entrypoint.sh RUN chmod +x /entrypoint.sh ENTRYPOINT ["/entrypoint.sh"] 

And my entrypoint.sh looks like this:

#!/bin/bash echo Fixing permissions... chown -R www-data:www-data /var/www/html/wp-content/ 

But then I realized that I was overriding the ENTRYPOINT of the original wordpress image, and the container exited always with code 0.

Then I tried with CMD instead of ENTRYPOINT, and I changed my Dockerfile like this:

FROM wordpress:5.1.1  # increase upload limit RUN touch /usr/local/etc/php/conf.d/uploads.ini \     && echo "upload_max_filesize = 10M;" >> /usr/local/etc/php/conf.d/uploads.ini  CMD chown -R www-data:www-data /var/www/html/wpcontent/ 

But I receive always the error that the file or folder doesn't exists.

I've tried to use CMD also like this:
CMD ["chown", "-R", "www-data:www-data", "/var/www/html/wp-content/"]
but without success.

Question

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There is a way to run a command after the original ENTRYPOINT?
Do you know otherwise a better way to solve this problem?