add build log access: nbapi build <id>, nbshell builds log, routing triggers

bin/nbapi

@@ -13,6 +13,7 @@
 #   nbapi usage [--from YYYY-MM-DD] [--to YYYY-MM-DD]   # billable CPU-seconds + count
 #   nbapi summary                                       # aggregated build metrics
 #   nbapi builds [--limit N]                            # recent build history
+#   nbapi build <id>                                    # single build detail + status_message
 #   nbapi raw <path>                                    # GET any API path verbatim
 #
 # Output is JSON (pretty-printed via jq when available).
@@ -77,15 +78,19 @@ builds)
 	done
 	get "/builds?limit=${limit}"
 	;;
+build)
+	[ -n "${1:-}" ] || { echo "nbapi build: need a build id" >&2; exit 2; }
+	get "/builds/$1"
+	;;
 raw)
 	[ -n "${1:-}" ] || { echo "nbapi raw: need a path" >&2; exit 2; }
 	get "$1"
 	;;
 ""|-h|--help|help)
-	sed -n '2,20p' "$0"
+	sed -n '2,21p' "$0"
 	;;
 *)
-	echo "nbapi: unknown command '$cmd' (try: usage, summary, builds, raw)" >&2
+	echo "nbapi: unknown command '$cmd' (try: usage, summary, builds, build, raw)" >&2
 	exit 2
 	;;
 esac