Merge branch 'move-tests-back-in' into 'master'

fix: move tests back into this repo

Changes:
- Moved test back into this repo, to remove problems with developers testing pipelines
- Moved kaniko default destination from `CI_COMMIT_TAG` and `CI_COMMIT_BRANCH` to just `CI_COMMIT_REF_NAME`, as that last one will contain either the branch or the tag, without having to check where we are. This fixes the problem of nothing being built in an MR pipeline
- Simplified pytest
- Added {}s everywhere
- Removed some of the darkness

See merge request ci/templates!8