tweak push script

Author: drpebcak

.ci/push.sh

@@ -6,14 +6,14 @@ setup_git() {
 }
 
 commit_website_files() {
-  git checkout master
+  git checkout -b master
   git add repo/index.yaml
   git commit --message "Update index [skip ci]"
 }
 
 upload_files() {
   git remote add remote https://${GITHUB_TOKEN}@github.com/FusionAuth/charts.git >/dev/null 2>&1
-  git push --quiet remote master
+  git push --quiet --set-upstream remote master
 }
 
 setup_git