change shebangs of all .sh scripts to bash

On operating systems where /bin/sh is not Bash, some scripts are invalid
because of bashisms, and building Lix fails with errors like this:
`render-manpage.sh: 3: set: Illegal option -o pipefail`
This modifies all scripts that use a `/bin/sh` shebang to `/usr/bin/env
bash`, including currently POSIX-compliant ones, to prevent any future
confusion.

Change-Id: Ia074cc6db42d40fc59a63726f6194ea0149ea5e0

doc/manual/process-includes.sh

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

doc/manual/render-manpage.sh

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

maintainers/buildtime_report.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 
 # Generates a report of build time based on a meson build using -ftime-trace in
 # Clang.

package.nix

@@ -304,6 +304,9 @@ stdenv.mkDerivation (finalAttrs: {
       else
         appendToVar configureFlags "--disable-tests"
       fi
+
+      # Fix up /usr/bin/env shebangs relied on by the build
+      patchShebangs --build tests/ doc/manual/
     '';
 
   mesonBuildType = "debugoptimized";

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