add safeguard against running from another branch than main in push-to-prod script

bin/push-to-prod.sh

@@ -1,6 +1,12 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # push main to prod (which will trigger the deploy action)
+CURR_BRANCH=$(git symbolic-ref --short HEAD)
+if [[ ${CURR_BRANCH} == "main" ]]; then 
+  echo pushing main to prod...
   git checkout prod
   git merge --ff-only main
   git push origin prod
   git checkout main
+else
+  echo "This script is meant to be run from the main branch!"
+fi