docker-entrypoint: make bucketd bootstrap configurable

docker-entrypoint.sh

@@ -117,6 +117,10 @@ if [[ -n "$BUCKET_DENY_FILTER" ]]; then
     JQ_FILTERS_CONFIG="$JQ_FILTERS_CONFIG | .utapi.filter.deny.bucket=[\"$BUCKET_DENY_FILTER\"]"
 fi
 
+if [[ "$BUCKETD_BOOTSTRAP" ]]; then
+    JQ_FILTERS_CONFIG="$JQ_FILTERS_CONFIG | .bucketd.bootstrap=[\"$BUCKETD_BOOTSTRAP\""]
+fi
+
 if [[ $JQ_FILTERS_CONFIG != "." ]]; then
     jq "$JQ_FILTERS_CONFIG" config.json > config.json.tmp
     mv config.json.tmp config.json