Add precompression step to frontend

frontend/compress.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+multicompress() {
+    local file="$1"
+    if command -v gzip &>/dev/null; then
+        gzip --best --stdout --keep "$file" >"$file.gz"
+    fi
+
+    if command -v zstd &>/dev/null; then
+        zstd --keep --force -19 --quiet "$file" -o "$file.zst"
+    fi
+
+    if command -v brotli &>/dev/null; then
+        brotli --best --force -o "$file.br" "$file"
+    fi
+}
+
+export -f multicompress
+# create pre-compressed variants gzip, zstd, brotli for dist files
+find ./dist/ -type f ! -name '*.gz' ! -name '*.br' ! -name '*.zst' -exec bash -c 'multicompress "$0"' {} \;