Do not overwrite UPDATE env

diff --git a/bin/update-wiki b/bin/update-wiki
index cfdc09a..ccf559c 100755 (executable)
--- a/bin/update-wiki
+++ b/bin/update-wiki
@@ -6,7 +6,7 @@ umask 0002
 WC="/srv/dsa.debian.org/dsa-wiki"
 DEST="/srv/dsa.debian.org/htdocs"
 URL="https://dsa.debian.org/"
-UPDATE=1
+UPDATE=${UPDATE:-1}
 
 ! [ -e "$HOME/.dsa-wiki-local" ] || . "$HOME/.dsa-wiki-local"