build: fix lint sh errors

Author: JackStrohm-asana

stage_for_s3.sh

@@ -1,7 +1,7 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 mkdir stage
-cd stage
+cd stage || exit
 
 TIMESTAMP=$(date '+%Y%m%d.%H%M')
 
@@ -13,7 +13,7 @@ gh release download -p "*.xz"
 curl "https://asana-oss-cache.s3.us-east-1.amazonaws.com/node-fibers/fibers-5.0.4.pc.tgz"  --output fibers-5.0.4.tar.gz
 tar -xzf fibers-5.0.4.tar.gz
 
-find . -name "*.gz" | while read a
+find . -name "*.gz" | while read -r a
 do
 	tar -xzf "$a" -C package/bin
 	rm "$a"