add env distros for builder

diff --git a/builder/builder b/builder/builder
index 83ea7e276c1363c4c235c045d3642bb7418ad76e..c583ee1edc0fa76e28bac882d336e56aae5f8e92 100755 (executable)
--- a/builder/builder
+++ b/builder/builder
@@ -36,7 +36,7 @@ run_build_container()
 
 main()
 {
-       local distros="debian:oldstable-slim debian:stable-slim debian:testing-slim ubuntu:focal ubuntu:latest ubuntu:rolling"
+       local distros=${DISTROS:="debian:oldstable-slim debian:stable-slim debian:testing-slim ubuntu:focal ubuntu:latest ubuntu:rolling"}
        mkdir -p build
        cp builder/run build/run