GH-2242 - Add ticket backport script.

etc/copy-ticket.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+sourceGh="GH-$1"
+json=$(gh issue view $1 --json=title,labels)
+
+title=$(echo $json | jq -r '.title')
+labels=$(echo $json | jq -r '.labels[].name' | paste -sd ',' -)
+
+gh issue create --title "$title" \
+  --body "Back-port of $sourceGh." \
+  --label "$labels" \
+  --assignee "@me" \
+  --milestone "$2"