Fix E2BIG error in optimize.sh caused by too many arguments

Instead of passing the full list of images once, use smaller batches of images paths passed to sharp-cli.

optimize.sh

@@ -1,3 +1,28 @@
 #!/bin/bash
+set -euo pipefail
 echo "running image optimization"
-npx --yes sharp-cli resize 1200 --withoutEnlargement true --optimise true --progressive true --withMetadata false --failOn none --input $(find ./docs \( -name cache -prune \) -o -name '*' -type f -exec file {} \; | awk -F: '{ if ($2 ~/[Ii]mage|EPS/) print $1}') --output "{dir}/{base}"
+
+ROOT_DIR="./docs"
+BATCH_SIZE=73
+
+# Build a list of image files (skip "cache" directories)
+file_list=$(mktemp)
+find "$ROOT_DIR" \( -name cache -prune \) -o -type f -exec file {} \; \
+  | awk -F: '{ if ($2 ~ /[Ii]mage|EPS/) print $1 }' > "$file_list"
+
+# Process in batches using xargs; each invocation gets up to $BATCH_SIZE files
+sparp_cli_cmd() {
+  local batch_args=("$@")
+  npx --yes sharp-cli resize 1200 \
+    --withoutEnlargement true --optimise true --progressive true --withMetadata false --failOn none \
+    --input "${batch_args[@]}" --output "{dir}/{base}"
+}
+
+export -f sparp_cli_cmd
+
+# Use xargs to call a shell wrapper which forwards the args into xargs_cmd
+# The "_" is the placeholder $0 so filenames become $1..$N inside the wrapper
+xargs -r -n "$BATCH_SIZE" bash -c 'sparp_cli_cmd "$@"' _ < "$file_list"
+
+# Cleanup
+rm -f "$file_list"