Implement autobackup-operator controllers, tests, CI and packaging

PVCs and CloudNativePG Clusters need S3 buckets and backup schedules
provisioned consistently. This operator watches the
backups.unkin.net/{schedule,destination} annotations on those objects and
provisions everything needed to back them up, with no new CRDs.

- Add a PVC controller that provisions cephrgw ObjectStoreUser/Bucket/BucketAccess,
  auto-generates a restic repo-password Secret and creates a k8up Schedule scoped
  to the PVC via spec.backup.volumes[].persistentVolumeClaim.claimName.
- Add a CNPG Cluster controller that provisions the same bucket stack, idempotently
  patches spec.backup.barmanObjectStore (leaving a user-set destinationPath alone
  with a Warning event) and creates a ScheduledBackup.
- Resolve destinations through a ConfigMap lookup table; requeue until the
  BucketAccess is Ready before creating schedule resources; own-reference created
  resources and retain bucket data by default.
- Add schedule-mapping helpers (k8up 5-field/shortcut pass-through, CNPG 6-field
  seconds-first) and deterministic, length-bounded name derivation.
- Add unit tests (schedule mapping, name derivation, destination resolution) and
  envtest controller tests for both paths, wiring the external CRDs into envtest.
- Add kubebuilder-generated RBAC, a Dockerfile (distroless/nonroot), Woodpecker
  lint/test/build pipelines and a tag-triggered image push to the artifactapi
  docker-internal registry, plus a version-bump Makefile and deploy manifests.

vendor/github.com/google/gnostic-models/openapiv2/README.md

@@ -0,0 +1,14 @@
+# OpenAPI v2 Protocol Buffer Models
+
+This directory contains a Protocol Buffer-language model and related code for
+supporting OpenAPI v2.
+
+Gnostic applications and plugins can use OpenAPIv2.proto to generate Protocol
+Buffer support code for their preferred languages.
+
+OpenAPIv2.go is used by Gnostic to read JSON and YAML OpenAPI descriptions into
+the Protocol Buffer-based datastructures generated from OpenAPIv2.proto.
+
+OpenAPIv2.proto and OpenAPIv2.go are generated by the Gnostic compiler
+generator, and OpenAPIv2.pb.go is generated by protoc, the Protocol Buffer
+compiler, and protoc-gen-go, the Protocol Buffer Go code generation plugin.