Integrate gitlab-ci/extend_board_support and 2 more
requested to merge integrate/gitlab-ci/extend_board_support/into/seco_lf_v2021.04 into seco_lf_v2021.04
[BOARD SUPPORT] Include config file in main yaml
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[RELEASE] Remove changelog for description
- The description shall be filled by the Release Notes file
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[BOARD SUPPORT] Include C12, C26 and C43 boards