Use /usr/bin/env bash instead of /bin/bash for scripts to support more systems

Makefile

@@ -4,7 +4,7 @@
 # Makefile for kustomize CLI and API.
 
 MYGOBIN := $(shell go env GOPATH)/bin
-SHELL := /bin/bash
+SHELL := /usr/bin/env bash
 export PATH := $(MYGOBIN):$(PATH)
 MODULES := '"cmd/config" "api/" "kustomize/" "kyaml/"'
 

scripts/check-go-mod.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Copyright 2019 The Kubernetes Authors.
 # SPDX-License-Identifier: Apache-2.0
 

scripts/check-multi-module.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 
@@ -20,4 +20,4 @@ else
     echo "Multi-module check skipped. No PULL_NUMBER provided.
 
 To run this check locally set PULL_NUMBER to the PR ID from GitHub."
-fi
+fi

scripts/kyaml-pre-commit.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Copyright 2019 The Kubernetes Authors.
 # SPDX-License-Identifier: Apache-2.0