* This commit allows gitlab-ci to be integrated in two other custom
projects

* The script search for all type of artifacts (uboot, kernel, fs, image
files) and exit with an error in case something is missing
* This prevent to have build jobs that succed even though not all
artifacts were produced

* Instead of hardcoding the gitlab repository ID the script accepts a
list of which the manifest project it the first element
* Introduce CHANGELOG_PROJECTS variable containing the list of projects

* Fix name of uboot artifacts for all NXP boards
* Create array of uboot files for c31 boards
* The deploy search for all uboot artifacts in the build path
* Create rule to not deploy artifacts to public container if a tag
occurs

* The tasks to be executed by the deploy and notify jobs are moved to
shell scripts inside the scripts folder
* This avoid having a long list of instructions inside the pipeline
file

* Fix on KERNEL variable for c31
* Increase deploy job timeout to 1h

* Insert separate search for projects on which the CUSTOM variable is
defined

* This is necessary for custom projects manifest to not run jobs
regarding catalogue boards

* Modify common.py script to hide integration comments on custom
projects

* When a tag occurs the repo tool use the reference to the tag instead
of the head of the MASTER_BRANCH

* The two distros need to have a separate sstate cache

* Waiting for a stable release of the Intel Apollo Lake distro

* Add condition to use public container to store report when a tag
occurs

* The SSH key and configs are no more needed since migrated everything
to https

* Adding support to Edgehog Embedded base and full image

* Separate caches folder to be used for the two distros
* Avoid using cache and downloads for tagged builds
* Reduce expiration policy of the build to 24 hours