Add shebangs for shellcheck (#4493)

* Add shebangs for shellcheck

See #AR-1406

* Add shebangs for shellcheck

Also for `extensions` scripts

extensions/detect-unused-extensions.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 ## Configuration
 export LOG_ALL_HOOK_TRACES=no # Should we log all hook function traces to stdout? (no, or level: wrn info)
 

extensions/flash-kernel.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # This runs *after* user_config. Don't change anything not coming from other variables or meant to be configured by the user.
 function extension_prepare_config__prepare_flash_kernel() {
 	# Configuration defaults, or lack thereof.

extensions/gen-sample-extension-docs.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 ## Hooks
 function extension_metadata_ready__499_display_docs_generation_start_info() {
 	display_alert "Generating hook documentation and sample extension"

extensions/grub-riscv64.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # This runs *after* user_config. Don't change anything not coming from other variables or meant to be configured by the user.
 function extension_prepare_config__prepare_grub-riscv64() {
 	display_alert "Prepare config" "${EXTENSION}" "info"

extensions/grub-sbc-media.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # This runs *after* user_config. Don't change anything not coming from other variables or meant to be configured by the user.
 	function extension_prepare_config__prepare_grub-sbc-media() {
 	display_alert "Prepare config" "${EXTENSION}" "info"

extensions/grub.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # This runs *after* user_config. Don't change anything not coming from other variables or meant to be configured by the user.
 function extension_prepare_config__prepare_flash_kernel() {
 	# Extension configuration defaults.

extensions/marvell-tools.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 function fetch_sources_tools__marvell_tools() {
 	fetch_from_repo "https://github.com/MarvellEmbeddedProcessors/A3700-utils-marvell" "marvell-tools" "branch:master"
 	fetch_from_repo "https://github.com/MarvellEmbeddedProcessors/mv-ddr-marvell.git" "marvell-ddr" "branch:master"

extensions/nvidia.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 function pre_install_kernel_debs__build_nvidia_kernel_module() {
 
 	export INSTALL_HEADERS="yes"

extensions/rkbin-tools.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 function fetch_sources_tools__rkbin_tools() {
 	fetch_from_repo "https://github.com/armbian/rkbin" "rkbin-tools" "branch:master"
 }

extensions/sunxi-tools.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 function fetch_sources_tools__sunxi_tools() {
 	fetch_from_repo "https://github.com/linux-sunxi/sunxi-tools" "sunxi-tools" "branch:master"
 }

lib/extensions.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # global variables managing the state of the extension manager. treat as private.
 declare -A extension_function_info                # maps a function name to a string with KEY=VALUEs information about the defining extension
 declare -i initialize_extension_manager_counter=0 # how many times has the extension manager initialized?

lib/functions/bsp/bsp-cli.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 create_board_package() {
 	display_alert "Creating board support package for CLI" "$CHOSEN_ROOTFS" "info"
 

lib/functions/bsp/bsp-desktop.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 create_desktop_package() {
 
 	echo "Showing PACKAGE_LIST_DESKTOP before postprocessing" >> "${DEST}"/${LOG_SUBPATH}/output.log

lib/functions/bsp/utils-bsp.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # copy_all_packages_files_for <folder> to package
 #
 copy_all_packages_files_for() {

lib/functions/cli/cli-entrypoint.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 function cli_entrypoint() {
 	if [[ "${ARMBIAN_ENABLE_CALL_TRACING}" == "yes" ]]; then
 		set -T # inherit return/debug traps

lib/functions/cli/utils-cli.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 #  Add the variables needed at the beginning of the path
 check_args() {
 

lib/functions/compilation/atf.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 compile_atf() {
 	if [[ $CLEAN_LEVEL == *make* ]]; then
 		display_alert "Cleaning" "$ATFSOURCEDIR" "info"

lib/functions/compilation/debs.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 compile_firmware() {
 	display_alert "Merging and packaging linux firmware" "@host" "info"
 

lib/functions/compilation/kernel-debs.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 create_linux-source_package() {
 	ts=$(date +%s)
 	local sources_pkg_dir tmp_src_dir

lib/functions/compilation/kernel.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 compile_kernel() {
 	if [[ $CLEAN_LEVEL == *make* ]]; then
 		display_alert "Cleaning" "$LINUXSOURCEDIR" "info"