.gitlab-ci.yml: Switch to rules for determining when to run a pipeline and limit dist run to tags

https://docs.gitlab.com/ee/ci/jobs/job_control.html

We're currently using only which is deprecated:

This:

• moves us to rules from only
• makes the dist pipeline only run for tags, as we don't want it to run twice (<which breaks the api repo somehow) when we create a release branch and a tag simultaneously. we also don't want to modify a release post-release without bumping the release number (v1.3.1 vs v1.3.0) as otherwise we sacrifice user (updates) and dev (people who git switch v1.3.0) friendliness.

changed title from .gitlab-ci.yml: Switch to rules for determining when to run a pipeline to .gitlab-ci.yml: Switch to rules for determining when to run a pipeline and limit dist run to tags

By ave on 2023-11-26T16:20:31 (imported from GitLab)

added 2 commits

• 9b19c434 - 1 commit from branch main
• aa4b98c0 - .gitlab-ci.yml: Switch to rules/if

Compare with previous version

By ave on 2023-11-26T16:27:07 (imported from GitLab)