Merge branch '16-fix-enhance-grype-job' into 'beta'

feat!: improves container pipelines, kaniko and grype in monorepo and polirepo repositories

- rules are back to the kaniko job
- kaniko and grype jobs hidden by default, but include default polirepo job
- kaniko and grype now provide hidden monorepo job, to be extended by user in pipelines
- tests are changed to reflect the above

BREAKING CHANGE: use of the word docker was replaced by container where appropriate

See merge request just-ci/templates!30