gzip is enforced? please add a var.

[shleeable]

Steps To Reproduce

I've noticed that gzip compression is enabled by default for fpm-nginx

Outcome

docker-php/src/variations/fpm-nginx/etc/nginx/server-opts.d/performance.conf

Lines 31 to 36 in dbeee9b

	# gzip
	gzip on;
	gzip_vary on;
	gzip_proxied any;
	gzip_comp_level 6;
	gzip_types text/plain text/css text/xml application/json application/javascript application/rss+xml application/atom+xml image/svg+xml;

What did you expect?

I have caddy in front to offer ZSTD compression, but it's already compressed with gzip at the server side.

Affected Docker Images

serversideup/php:8.4-fpm-nginx

Anything else?

No response