add script to sync upstream

Author: karan-batavia

upstream_sync.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+set -e
+
+git remote set upstream https://github.com/ShiftLeftSecurity/overflowdb
+
+usage() {
+  echo "Usage: $0 [--publish]"
+  exit 1
+}
+
+PUBLISH=false
+while [[ "$#" -gt 0 ]]; do
+  case $1 in
+    --publish) PUBLISH=true ;;
+    *) usage ;;
+  esac
+  shift
+done
+
+git fetch upstream
+
+git checkout sync
+git merge upstream/master
+git push origin sync
+
+if [ "$PUBLISH" = true ]; then
+  git checkout master
+  git merge sync
+  git push origin master
+fi