shellcheck: Fix shellcheck SC2148

> Tips depend on target shell and yours is unknown. Add a shebang.

Add
```
#!/usr/bin/env bash
```

Signed-off-by: stevenhorsman <steven@uk.ibm.com>

src/runtime/hack/update-generated-runtime-proto.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 #
 # Copyright 2019 HyperHQ Inc.
 #

tests/error.sh

@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+#
 # Copyright (c) 2022-2024 Intel Corporation
 #
 # SPDX-License-Identifier: Apache-2.0

tools/osbuilder/rootfs-builder/alpine/config.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 #
 # Copyright (c) 2018 Intel Corporation
 #

tools/osbuilder/rootfs-builder/cbl-mariner/config.sh

@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+#
 # Copyright (c) 2023 Microsoft Corporation
 #
 # SPDX-License-Identifier: Apache-2.0

tools/osbuilder/rootfs-builder/cbl-mariner/rootfs_lib.sh

@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+#
 # Copyright (c) 2023 Microsoft Corporation
 #
 # SPDX-License-Identifier: Apache-2.0

tools/osbuilder/rootfs-builder/debian/config.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 #
 # Copyright (c) 2018 SUSE
 #

tools/osbuilder/rootfs-builder/debian/rootfs_lib.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 #
 # Copyright (c) 2018 SUSE
 #

tools/osbuilder/rootfs-builder/template/config_template.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 #
 # Copyright (c) 2018 Intel Corporation
 #

tools/osbuilder/rootfs-builder/template/rootfs_lib_template.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 #
 # Copyright (c) 2018-2020 Intel Corporation
 #

tools/osbuilder/rootfs-builder/ubuntu/config.sh

@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+#
 # Copyright (c) 2018 Yash Jain, 2022 IBM Corp.
 #
 # SPDX-License-Identifier: Apache-2.0

tools/osbuilder/rootfs-builder/ubuntu/rootfs_lib.sh

@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+#
 # Copyright (c) 2018 Yash Jain, 2022 IBM Corp.
 #
 # SPDX-License-Identifier: Apache-2.0
@@ -49,7 +51,7 @@ EOF
 	apt update
 
 	if ! multistrap -a "$DEB_ARCH" -d "$rootfs_dir" -f "$multistrap_conf"; then
-		if [ "$OS_VERSION" = "focal" ]; then	
+		if [ "$OS_VERSION" = "focal" ]; then
 			echo "WARN: multistrap failed, proceed with hack for Ubuntu 20.04"
 			build_dbus $rootfs_dir
 		else

tools/osbuilder/tests/test_config.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 #
 # Copyright (c) 2018 SUSE LLC
 #