Add $GC_PROJECT_LIST to environment header

Change-Id: I9de3623d7b4dfab5ab6e74b8e4ecd51f8f322db8
diff --git a/maintenance/git-gc/scripts/utils.sh b/maintenance/git-gc/scripts/utils.sh
index b2677da..51f1abc 100755
--- a/maintenance/git-gc/scripts/utils.sh
+++ b/maintenance/git-gc/scripts/utils.sh
@@ -166,6 +166,7 @@
 
 function log_env() {
   log "######## ENVIRONMENT ########"
+  log "# GC_PROJECT_LIST=${GC_PROJECT_LIST}"
   log "# JGIT=${JGIT}"
   log "# GIT=${GIT}"
   log "# GIT_HOME=${GIT_HOME}"