use latest Firecracker release

run shellcheck on all bash scripts

boot-time: disable keyboard probing from cmdline

Set execute bit on ensure_resources.sh

Use ip instead of deprecated ifconfig

Fix tee command

Fix instance name

Use the current user variable

Correct SSH key permission after download

use resources downloaded at initial setup

download resources from S3

update firecracker binary to v0.25.0

update firecracker binary to v0.24.4

update demo to v0.24.0

Update demo to v0.23.0