generation: Add a script to install the initramfs image on the same machine.

This script allows to by-pass shacache/shadir: execute ```40upload-image.sh```
instead of ```35install-image-directly.sh```.

generation/35install-image-directly.sh

+#!/bin/bash
+## Temporary script created for debugging
+
+set -e
+
+# get the root of the git repository
+GIT_ROOT=$(git rev-parse --show-toplevel)
+cd "$GIT_ROOT"
+
+# define useful variables
+source generation/00env.sh
+
+cp "$UEFI_IMAGE_NAME" "/boot/efi/EFI/Linux/$UEFI_IMAGE_NAME"
+efibootmgr -b 100 -B || true
+efibootmgr -b 100 --create --disk /dev/nvme0n1p1 --label "test_deploy" --loader "/EFI/Linux/$UEFI_IMAGE_NAME"