Merge pull request #62657 from matthyx/master

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Update all script shebangs to use /usr/bin/env interpreter instead of /bin/interpreter

This is required to support systems where bash doesn't reside in /bin (such as NixOS, or the *BSD family) and allow users to specify a different interpreter version through $PATH manipulation.
https://www.cyberciti.biz/tips/finding-bash-perl-python-portably-using-env.html
```release-note
Use /usr/bin/env in all script shebangs to increase portability.
```

hack/lib/etcd.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright 2014 The Kubernetes Authors.
 #

hack/lib/golang.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright 2014 The Kubernetes Authors.
 #

hack/lib/init.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright 2014 The Kubernetes Authors.
 #

hack/lib/logging.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright 2014 The Kubernetes Authors.
 #

hack/lib/protoc.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright 2017 The Kubernetes Authors.
 #

hack/lib/swagger.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright 2016 The Kubernetes Authors.
 #

hack/lib/test.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright 2015 The Kubernetes Authors.
 #

hack/lib/util.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright 2014 The Kubernetes Authors.
 #
@@ -554,7 +554,7 @@ function kube::util::create_signing_certkey {
     local id=$3
     local purpose=$4
     # Create client ca
-    ${sudo} /bin/bash -e <<EOF
+    ${sudo} /usr/bin/env bash -e <<EOF
     rm -f "${dest_dir}/${id}-ca.crt" "${dest_dir}/${id}-ca.key"
     ${OPENSSL_BIN} req -x509 -sha256 -new -nodes -days 365 -newkey rsa:2048 -keyout "${dest_dir}/${id}-ca.key" -out "${dest_dir}/${id}-ca.crt" -subj "/C=xx/ST=x/L=x/O=x/OU=x/CN=ca/emailAddress=x/"
     echo '{"signing":{"default":{"expiry":"43800h","usages":["signing","key encipherment",${purpose}]}}}' > "${dest_dir}/${id}-ca-config.json"
@@ -576,7 +576,7 @@ function kube::util::create_client_certkey {
         SEP=","
         shift 1
     done
-    ${sudo} /bin/bash -e <<EOF
+    ${sudo} /usr/bin/env bash -e <<EOF
     cd ${dest_dir}
     echo '{"CN":"${cn}","names":[${groups}],"hosts":[""],"key":{"algo":"rsa","size":2048}}' | ${CFSSL_BIN} gencert -ca=${ca}.crt -ca-key=${ca}.key -config=${ca}-config.json - | ${CFSSLJSON_BIN} -bare client-${id}
     mv "client-${id}-key.pem" "client-${id}.key"
@@ -600,7 +600,7 @@ function kube::util::create_serving_certkey {
         SEP=","
         shift 1
     done
-    ${sudo} /bin/bash -e <<EOF
+    ${sudo} /usr/bin/env bash -e <<EOF
     cd ${dest_dir}
     echo '{"CN":"${cn}","hosts":[${hosts}],"key":{"algo":"rsa","size":2048}}' | ${CFSSL_BIN} gencert -ca=${ca}.crt -ca-key=${ca}.key -config=${ca}-config.json - | ${CFSSLJSON_BIN} -bare serving-${id}
     mv "serving-${id}-key.pem" "serving-${id}.key"
@@ -642,7 +642,7 @@ EOF
 
     # flatten the kubeconfig files to make them self contained
     username=$(whoami)
-    ${sudo} /bin/bash -e <<EOF
+    ${sudo} /usr/bin/env bash -e <<EOF
     $(kube::util::find-binary kubectl) --kubeconfig="${dest_dir}/${client_id}.kubeconfig" config view --minify --flatten > "/tmp/${client_id}.kubeconfig"
     mv -f "/tmp/${client_id}.kubeconfig" "${dest_dir}/${client_id}.kubeconfig"
     chown ${username} "${dest_dir}/${client_id}.kubeconfig"

hack/lib/version.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Copyright 2014 The Kubernetes Authors.
 #