Merge "change shebangs of all .sh scripts to bash" into main

tests/functional/install-darwin.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 set -eux
 

tests/functional/nix-daemon-untrusting.sh

@@ -1,3 +1,3 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 exec nix-daemon --force-untrusted "$@"

tests/functional/push-to-store-old.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 set -x
 set -e

tests/functional/push-to-store.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 set -x
 set -e