chore(release): 3.15.1

## [3.15.1](https://gitlab.tsn.tno.nl/ci/templates/compare/v3.15.0...v3.15.1) (2021-07-27)

### Bug Fixes

* set output dir to build root ([68cf8a46](https://gitlab.tsn.tno.nl/ci/templates/commit/68cf8a462e2249d710fef25581c3acf48e4c14eb))