Use env to detect bash.

bin/create_agent_keypair

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 ## This script creates an "agent keypair".  The private key is stored on an agent, and is used to
 ## encrypt/decrypt a per-repository symmetric key.

hooks/environment.agent

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -eou pipefail
 

hooks/post-checkout

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 ## post-checkout hook: This hook performs the actual decryption of secrets
 

hooks/post-command

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 ## post-command hook: This hook implements treehash verification and pipeline launching