Last IP shows Reverse Proxy IP address

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Probably you need to remove the same definitions from docker, modify your app.yml and rebuild:

run:
  - exec: echo "Beginning of custom commands"

  - replace:
       filename: /etc/nginx/conf.d/discourse.conf
       from: $proxy_add_x_forwarded_for
       to: $http_fastly_client_ip
       global: true

  - exec:
       cmd:
         - sed -i 's/client_max_body_size 10m ;/client_max_body_size 100m ;/g' /etc/nginx/conf.d/discourse.conf
         - sed -i '/proxy_set_header X-Real-IP $remote_addr;/d' /etc/nginx/conf.d/discourse.conf
         - sed -i '/proxy_set_header X-Forwarded-For $http_fastly_client_ip;/d' /etc/nginx/conf.d/discourse.conf
         - sed -i '/proxy_set_header X-Forwarded-Proto $scheme;/d' /etc/nginx/conf.d/discourse.conf

  - exec: echo "End of custom commands"

This block has 100m limit for max_body_size as well (the first sed command makes a replacement). The other sed commands remove lines from discourse.conf inside docker before container starts.

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