When I uploaded the banner, a 500 Internal Server Error occurred

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Description of the problem

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I try to upload a banner to a contest, contest_id is 3.

But a 500 Internal Server Error occurred.

BTW, I use docker to run domserver.

I checked the user and group to which the corresponding folder belongs.

And I also check the nginx.conf.

So I changed the user group of the banners folder, and the upload was successful，like below:

But if you change the user configuration item in nginx.conf to user domjudge;, it should also be work.

So which kind of change do you think we should make better?

Your environment

Include details about your installation here.

DOMjudge version (e.g. 7.0.0 or a github commit hash)

Operating system / Linux distribution and version (e.g. Ubuntu 18.04)

Webserver (e.g. Apache or nginx)

8.0.0DEV
Debian
Nginx

Steps to reproduce

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Step 1

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Step 3

Expected behaviour

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Actual behaviour

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Any other information that you want to share?

Please include webserver, symfony and judgedaemon log snippets here as appropriate. Screenshots may help in case of UI bugs.

DOMjudge / domjudge-packaging