`tests/utils/env.sh` is only meant to be sourced, never executed
directly, therefore the `#!/bin/bash` line is useless.
Add a ShellCheck shell directive to tell ShellCheck that this is (at
least) Bash code.
Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Change-Id: Ieb9bd996e43e8609d1e3e7b7b3d614bd4db6f234
-#!/bin/bash
-#
# SPDX-FileCopyrightText: 2021-2022 EfficiOS, Inc.
# SPDX-License-Identifier: GPL-2.0-only
+# shellcheck shell=bash
+
# Sets the variable named `$1` to `$2` if it's not set (or empty), and
# exports it.
_set_var_def() {