Try out gzip_static

I hope this works

.build.yml

@@ -3,6 +3,7 @@ image: alpine/edge
 packages:
   - rsync
   - hugo
+  - zopfli
 sources:
   - https://git.sr.ht/~seirdy/seirdy.one
 secrets:

deploy.sh

@@ -22,6 +22,9 @@ case "$1" in
 		;;
 esac
 
+find public -type f -name '*.html' -o -name '*.css' -o -name '*.xml' -o -name '*.txt' \
+	| grep -v gemini \
+	| xargs -L1 zopfli
 rsync -avzP --exclude 'gemini' --exclude '*.gmi' --exclude 'misc/' --exclude 'music.txt' --exclude '.well-known' public/ "$www_prefix/" --delete
 rsync -avzP --exclude '*.html' --exclude 'misc/' --exclude 'music.txt' public/gemini/ public/about public/posts "$gemini_prefix/" --delete
 rsync -avzP public/posts/gemini.xml "$gemini_prefix/feed.xml"