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Add CI_MERGE_REQUEST_DESCRIPTION env variable

What does this MR do?

Merge requests contain their own description which is comparable to a git send-mail cover letter.

If the merge requests contains only a single commit the merge request description equal commit description per default. If the merge request contains multiple commits the description is user defined and ideally contains a summary of the proposed commits.

For CI purposes the merge request description can contain commands change the CI default behaviour. This is useful to explicitly run special cases.

The merge request description could contain a control command like the following:

CI-config: USE_SPECIAL_CASE_Z=1

The CI script can evaluate those options via the following command:

echo "$CI_MERGE_REQUEST_DESCRIPTION" | grep -e "^CI-config:" \
	cut -d ':' -f 2 | tr ' ' '\n' > extra_env

This method allow to run corner cases withouth modifying nor bloating the git log.

Does this MR meet the acceptance criteria?

Conformity

Edited by Laura Montemayor

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