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/compiler/context.go

@@ -0,0 +1,49 @@
+// Copyright 2017 Google LLC. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package compiler
+
+import (
+	yaml "go.yaml.in/yaml/v3"
+)
+
+// Context contains state of the compiler as it traverses a document.
+type Context struct {
+	Parent            *Context
+	Name              string
+	Node              *yaml.Node
+	ExtensionHandlers *[]ExtensionHandler
+}
+
+// NewContextWithExtensions returns a new object representing the compiler state
+func NewContextWithExtensions(name string, node *yaml.Node, parent *Context, extensionHandlers *[]ExtensionHandler) *Context {
+	return &Context{Name: name, Node: node, Parent: parent, ExtensionHandlers: extensionHandlers}
+}
+
+// NewContext returns a new object representing the compiler state
+func NewContext(name string, node *yaml.Node, parent *Context) *Context {
+	if parent != nil {
+		return &Context{Name: name, Node: node, Parent: parent, ExtensionHandlers: parent.ExtensionHandlers}
+	}
+	return &Context{Name: name, Parent: parent, ExtensionHandlers: nil}
+}
+
+// Description returns a text description of the compiler state
+func (context *Context) Description() string {
+	name := context.Name
+	if context.Parent != nil {
+		name = context.Parent.Description() + "." + name
+	}
+	return name
+}