docker: very aggressive CDN, media, css and js file caching on nginx site config

docker/nginx/leftypol.conf

@@ -21,17 +21,16 @@ server {
 	# Expire rules for static content
 	# Media: images, icons, video, audio, HTC
 	location ~* \.(?:jpg|jpeg|gif|png|webp|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm|htc)$ {
-		expires 1M;
-		access_log off;
 		log_not_found off;
-		add_header Cache-Control "public";
+		# Public cache, never changes until max-age expires, max-age of 1 month, can still be served while being
+		# revalidated or if the server is erroring for 1 day.
+		add_header Cache-Control "public, immutable, max-age=2592000, stale-while-revalidate=86400, stale-if-error=86400";
 	}
 	# CSS and Javascript
 	location ~* \.(?:css|js)$ {
-		expires 1y;
-		access_log off;
 		log_not_found off;
-		add_header Cache-Control "public";
+		# Public cache, max-age of 1 year, can still be served while being revalidated or if the server is erroring for 1 day.
+		add_header Cache-Control "public, max-age=31536000, stale-while-revalidate=86400, stale-if-error=86400";
 	}
 
 	location ~* \.(html)$ {