Additional configuration of nginx from env vars

[galethil]

Checklist

• I have followed (at least) the PR section of the contributing guide.
• I fixed all necessary PR warnings
• The commit history is clean
• The E2E tests are passing
• If possible, the issue has been divided into more subtasks
• I did a self review before requesting a review from another team member

Description

Option for admin to add custom configuration of nginx server

How to test

1. Check if e2e tests passed
2. Locally change Dockerfile.dev to Dockerfile in development docker-compose
3. Modify the new env variables
4. After starting of app with development/start-dev.sh script (note that frontend will not work) validate that nginx config was changed properly
5. you can use docker exec -it trubudget-dev-frontend-1 sh command and then display nginx config

Closes #1976

[openkfwCI]

	Notes	Time
❌	Note for Reviewer: E2E tests on pipeline 60386 on remote server failed	Thu, 19 Sep 2024 14:15:45 +0000

Generated by E2E-Test

[SamuelPull]

Can you add increased buffer size to nginx conf please?

proxy_busy_buffers_size 512k;
proxy_buffers 4 512k;
proxy_buffer_size 256k;