EB setting to make nginx look at assets in public/packs

25_nginx.config

# .ebextensions/25_nginx.config
# By default, Webpacker/Rails will compile assets into public/packs,
# but nginx by EB default settings doesn't look at that folder.
files:
  "/etc/nginx/conf.d/rails-webpack.conf" :
    # Modified from /etc/nginx/conf.d/webapp_healthd.conf
    mode: "000644"
    owner: root
    group: root
    content: |
      upstream my_app {
        server unix:///var/run/puma/my_app.sock;
      }

      log_format healthd '$msec"$uri"'
                      '$status"$request_time"$upstream_response_time"'
                      '$http_x_forwarded_for';

      server {
        listen 80;
        server_name _ localhost; # need to listen to localhost for worker tier

        if ($time_iso8601 ~ "^(\d{4})-(\d{2})-(\d{2})T(\d{2})") {
          set $year $1;
          set $month $2;
          set $day $3;
          set $hour $4;
        }

        access_log  /var/log/nginx/access.log  main;
        access_log /var/log/nginx/healthd/application.log.$year-$month-$day-$hour healthd;

        location / {
          proxy_pass http://my_app; # match the name of upstream directive which is defined above
          proxy_set_header Host $host;
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }

        location /assets {
          alias /var/app/current/public/assets;
          gzip_static on;
          gzip on;
          expires max;
          add_header Cache-Control public;
        }

        # This block is for webpack --START--
        location /packs {
          alias /var/app/current/public/packs;
          gzip_static on;
          gzip on;
          expires max;
          add_header Cache-Control public;
        }
        # This block is for webpack --END--

        location /public {
          alias /var/app/current/public;
          gzip_static on;
          gzip on;
          expires max;
          add_header Cache-Control public;
        }
      }
commands:
  10_rm_nginx_default_webapp_conf:
    command: |
      mv /etc/nginx/conf.d/webapp_healthd.conf \
         /etc/nginx/conf.d/webapp_healthd.conf.bak
    test: "[ -f /etc/nginx/conf.d/webapp_healthd.conf ]"
services:
  sysvinit:
    nginx:
      enabled: true
      ensureRunning: true
      files:
        - "/etc/nginx/conf.d/rails-webpack.conf"
      commands:
        - "10_rm_nginx_default_webapp_conf"