BREAKING CHANGE: the rules keyword is used instead of only for npm
related jobs. Update your overrides accordingly.

BREAKING CHANGE: rules keyword is used instead of only and except for
deploy jobs. Update your overrides accordingly.

BREAKING CHANGE: the NEXY_BOT_EMAIL needs to be set to an existing and
authorized GitLab account. Nexylan projects are not affected.

fix: default branch management

Closes #57

See merge request !138