heroku-22 buildpack migration for a SPA from static to nginx

nginx.conf.erb

daemon off;
# Heroku dynos have at least 4 cores.
worker_processes <%= ENV['NGINX_WORKERS'] || 4 %>;

events {
	use epoll;
	accept_mutex on;
	worker_connections <%= ENV['NGINX_WORKER_CONNECTIONS'] || 1024 %>;
}

http {
	gzip on;
	gzip_comp_level 2;
	gzip_min_length 512;
	gzip_proxied any; # Heroku router sends Via header

	server_tokens off;

	log_format l2met 'measure#nginx.service=$request_time request_id=$http_x_request_id';
	access_log <%= ENV['NGINX_ACCESS_LOG_PATH'] || 'logs/nginx/access.log' %> l2met;
	error_log <%= ENV['NGINX_ERROR_LOG_PATH'] || 'logs/nginx/error.log' %>;


	include mime.types;
	default_type application/octet-stream;
	sendfile on;

	# Must read the body in 5 seconds.
	client_body_timeout <%= ENV['NGINX_CLIENT_BODY_TIMEOUT'] || 5 %>;

	server {
		listen <%= ENV["PORT"] %>;
		server_name _;
		keepalive_timeout 5;
		client_max_body_size <%= ENV['NGINX_CLIENT_MAX_BODY_SIZE'] || 1 %>M;

        root dist/;

        add_header "Cache-Control" "no-store, no-cache";
        add_header "Access-Control-Allow-Origin" "<first origin>";
        add_header "Access-Control-Allow-Origin" "<second origin>";

        location / {
          if ($http_x_forwarded_proto != "https") {
            return 301 https://$host$request_uri;
          }
          try_files $uri.html $uri $uri/ =404;
        }

        location ~ \.html$ {
          try_files $uri =404;
        }

        location ~ ^/assets/.*$ {
          add_header "Cache-Control" "public, max-age=512000";
        }

        location ~ ^/.*$ {
          set $route /.*;
          try_files $uri.html $uri $uri/ /index.html =404;
        }
	}
}

For the record, after some trial and errors, here is my working config file when migrating a SPA served with the static buildpack using heroku-20 stack to the nginx buildpack on heroku-22 stack.