Add make stop and allow --incremental

[ci skip]

sbin/entrypoint.sh

@@ -6,12 +6,15 @@ set -eu -o pipefail
 run_jekyll() {
   set -eu
 
-  bundle exec jekyll serve \
-    --config "$JEKYLL_CONFIG" \
-    --host "$JEKYLL_HOST" \
-    --port "$JEKYLL_PORT" \
-    --trace \
-    --verbose
+  # shellcheck disable=SC2155
+  local args="--config $JEKYLL_CONFIG --host $JEKYLL_HOST --port $JEKYLL_PORT --trace --verbose"
+
+  if [[ $JEKYLL_ENV == "development" ]]; then
+    # shellcheck disable=SC2155
+    local args="${args} --incremental"
+  fi
+
+  bundle exec jekyll serve $args
 }
 
 # Main entrypoint