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/go-openapi/swag/fileutils/path.go

@@ -0,0 +1,52 @@
+// SPDX-FileCopyrightText: Copyright 2015-2025 go-swagger maintainers
+// SPDX-License-Identifier: Apache-2.0
+
+package fileutils
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+)
+
+// GOPATHKey represents the env key for gopath
+const GOPATHKey = "GOPATH"
+
+// FindInSearchPath finds a package in a provided lists of paths
+func FindInSearchPath(searchPath, pkg string) string {
+	pathsList := filepath.SplitList(searchPath)
+	for _, path := range pathsList {
+		if evaluatedPath, err := filepath.EvalSymlinks(filepath.Join(path, "src", pkg)); err == nil {
+			if _, err := os.Stat(evaluatedPath); err == nil {
+				return evaluatedPath
+			}
+		}
+	}
+	return ""
+}
+
+// FindInGoSearchPath finds a package in the $GOPATH:$GOROOT
+//
+// Deprecated: this function is no longer relevant with modern go.
+// It uses [runtime.GOROOT] under the hood, which is deprecated as of go1.24.
+func FindInGoSearchPath(pkg string) string {
+	return FindInSearchPath(FullGoSearchPath(), pkg)
+}
+
+// FullGoSearchPath gets the search paths for finding packages
+//
+// Deprecated: this function is no longer relevant with modern go.
+// It uses [runtime.GOROOT] under the hood, which is deprecated as of go1.24.
+func FullGoSearchPath() string {
+	allPaths := os.Getenv(GOPATHKey)
+	if allPaths == "" {
+		allPaths = filepath.Join(os.Getenv("HOME"), "go")
+	}
+	if allPaths != "" {
+		allPaths = strings.Join([]string{allPaths, runtime.GOROOT()}, ":")
+	} else {
+		allPaths = runtime.GOROOT()
+	}
+	return allPaths
+}