local-build: Standardise what's set for the local build scripts

We've a discrepancy on what's set along the scripts used to build the
Kata Cotainers artefacts locally.

Some of those were missing a way to easily debug them in case of a
failure happens, but one specific one (build-and-upload-payload.sh)
could actually silently fail.

All of those have been changed as part of this commut.

Fixes: #6908

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

tools/packaging/kata-deploy/local-build/kata-deploy-binaries-in-docker.sh

@@ -5,6 +5,7 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
+[ -z "${DEBUG}" ] || set -x
 set -o errexit
 set -o nounset
 set -o pipefail