fix: missing mime types and turning off autoindex for js-sdk endpoint (#3395)

Things weren't as smooth as I thought it would be.

### Legal Boilerplate

Look, I get it. The entity doing business as "Sentry" was incorporated in the State of Delaware in 2015 as Functional Software, Inc. and is gonna need some rights from me in order to utilize my contributions in this here PR. So here's the deal: I retain all rights, title and interest in and to my contributions, and by keeping this boilerplate intact I confirm that Sentry can use, modify, copy, and redistribute my contributions, under Sentry's choice of terms.

Author: aldy505

docker-compose.yml

@@ -457,8 +457,8 @@ services:
     volumes:
       - type: bind
         read_only: true
-        source: ./nginx
-        target: /etc/nginx
+        source: ./nginx.conf
+        target: /etc/nginx/nginx.conf
       - sentry-nginx-cache:/var/cache/nginx
       - sentry-nginx-www:/var/www
     depends_on:

nginx/nginx.conf renamed to nginx.conf

@@ -11,6 +11,7 @@ events {
 
 
 http {
+	include /etc/nginx/mime.types;
 	default_type application/octet-stream;
 
 	log_format main '$remote_addr - $remote_user [$time_local] "$request" '
@@ -89,8 +90,10 @@ http {
 			proxy_pass http://relay;
 		}
 		location ^~ /js-sdk/ {
-			autoindex on;
-			root  /var/www/js-sdk;
+			root /var/www/;
+			# This value is set to mimic the behavior of the upstream Sentry CDN. For security reasons,
+			# it is recommended to change this to your Sentry URL (in most cases same as system.url-prefix).
+			add_header Access-Control-Allow-Origin *;
 		}
 		location / {
 			proxy_pass http://sentry;