As part of [the releated Activate Account epic][1] a generic template
was created to allow OpenAPI clients to be generated from YAML schemata.

#93 covers moving this
template to the ci-templates repo and documenting it in the guidebook.
This provides the ci-template-side part of that issue.

The actual content is a straight copy-paste from the upstream template
and so should require minimal review.

[1]: uis/devops&205
[2]: https://gitlab.developers.cam.ac.uk/uis/devops/iam/activate-account/api/-/blob/main/.gitlab/openapi-generator.gitlab-ci.yml?ref_type=heads

chore: move GCP secrets documentation to guidebook

See merge request !108

This does not warrant a release.

feat: add new trigger-renovatebot job

See merge request !107

Add a new CI job to the common pipeline which triggers a run of
renovatebot for the CI pipeline's project if the
TRIGGER_RENOVATEBOT_ENABLED variable is set.

Since no jobs are added *unless* that variable is set, this ensures that
renovatebot runs are always explicitly triggered.

The auto-devops/trigger-renovatebot.yml template also includes a
template CI job which can be used to construct trigger jobs with more
elaborate rulesets.

fix: container scanning when using multi target docker images

See merge request !106

Combined maven pipeline configs from WRS and Java Common into a new common template

See merge request !104

fix(multi-target-docker-images): set env variables through before_script

See merge request !105

fix(multi-target-docker-images): split logic into multiple files

Closes #90

See merge request !103

chore: Configure Renovate

See merge request !95

fix(common-pipeline): correct include path for auto-devops template

See merge request !102