Install binfmt-support if update-binfmts is not available

ubuntu-24.04 on GitHub-hosted runners don't have `update-binfmts`
installed.

Resolves #15

setup-alpine.sh

@@ -195,6 +195,13 @@ if needs_emulator "$INPUT_ARCH"; then
 
 	group "Install $qemu_cmd emulator"
 
+	# TODO: Consider replacing it with a simple shell script to speed-up
+	#  the installation.
+	if ! command -V update-binfmts >/dev/null; then
+		info 'Installing binfmt-support from Ubuntu repository'
+		apt-get install --no-install-recommends -y binfmt-support
+	fi
+
 	if update-binfmts --display $qemu_cmd >/dev/null 2>&1; then
 		info "$qemu_cmd is already installed on the host system"