ci: dont fail downloading artifacts if no firecracker binaries exist

If the CI artifacts dont contain old firecracker releases, still succeed
at setting them up after downloading them.

Signed-off-by: Patrick Roy <roypat@amazon.co.uk>

Author: roypat

tools/setup-ci-artifacts.sh

@@ -12,7 +12,7 @@ say "Setup CI artifacts"
 cd build/img/$(uname -m)
 
 say "Fix executable permissions"
-find "firecracker" -type f |xargs chmod -c 755
+find "firecracker" -type f |xargs chmod -c 755 || true
 
 say "Generate SSH key to connect from host"
 if [ ! -s id_rsa ]; then