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.

cmd/operator/main.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"flag"
+	"os"
+
+	cephv1 "git.unkin.net/unkin/cephrgw-operator/api/v1alpha1"
+	k8upv1 "github.com/k8up-io/k8up/v2/api/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
+	ctrl "sigs.k8s.io/controller-runtime"
+	"sigs.k8s.io/controller-runtime/pkg/healthz"
+	"sigs.k8s.io/controller-runtime/pkg/log/zap"
+	metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server"
+
+	"git.unkin.net/unkin/autobackup-operator/internal/controller"
+)
+
+var scheme = runtime.NewScheme()
+
+func init() {
+	utilruntime.Must(clientgoscheme.AddToScheme(scheme))
+	utilruntime.Must(cephv1.AddToScheme(scheme))
+	utilruntime.Must(k8upv1.AddToScheme(scheme))
+}
+
+func main() {
+	var metricsAddr, probeAddr, destNamespace, destConfigMap string
+	var leaderElect bool
+
+	flag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "metrics endpoint address")
+	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "health probe address")
+	flag.BoolVar(&leaderElect, "leader-elect", false, "enable leader election")
+	flag.StringVar(&destNamespace, "destinations-namespace", envOr("POD_NAMESPACE", "autobackup-operator"),
+		"namespace holding the destinations ConfigMap")
+	flag.StringVar(&destConfigMap, "destinations-configmap", "autobackup-destinations",
+		"name of the destinations lookup ConfigMap")
+	flag.Parse()
+
+	ctrl.SetLogger(zap.New(zap.UseDevMode(false)))
+	logger := ctrl.Log.WithName("setup")
+
+	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
+		Scheme:                 scheme,
+		Metrics:                metricsserver.Options{BindAddress: metricsAddr},
+		HealthProbeBindAddress: probeAddr,
+		LeaderElection:         leaderElect,
+		LeaderElectionID:       "autobackup-operator",
+	})
+	if err != nil {
+		logger.Error(err, "unable to create manager")
+		os.Exit(1)
+	}
+
+	if err := controller.SetupAll(mgr, destNamespace, destConfigMap); err != nil {
+		logger.Error(err, "unable to set up controllers")
+		os.Exit(1)
+	}
+
+	if err := mgr.AddHealthzCheck("healthz", healthz.Ping); err != nil {
+		logger.Error(err, "unable to set up health check")
+		os.Exit(1)
+	}
+	if err := mgr.AddReadyzCheck("readyz", healthz.Ping); err != nil {
+		logger.Error(err, "unable to set up ready check")
+		os.Exit(1)
+	}
+
+	logger.Info("starting autobackup-operator")
+	if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
+		logger.Error(err, "manager exited with error")
+		os.Exit(1)
+	}
+}
+
+func envOr(key, def string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return def
+}