Adding initial version of Kubernetes backend (#552)

Co-authored-by: laszlocph <laszlo@laszlo.cloud>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Rynoxx <rynoxx@grid-servers.net>

pipeline/backend/kubernetes/volume.go

@@ -0,0 +1,44 @@
+package kubernetes
+
+import (
+	"strings"
+
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/resource"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+func PersistentVolumeClaim(namespace, name, storageClass, size string, storageRwx bool) *v1.PersistentVolumeClaim {
+	_storageClass := &storageClass
+	if storageClass == "" {
+		_storageClass = nil
+	}
+
+	var accessMode v1.PersistentVolumeAccessMode
+
+	if storageRwx {
+		accessMode = v1.ReadWriteMany
+	} else {
+		accessMode = v1.ReadWriteOnce
+	}
+
+	return &v1.PersistentVolumeClaim{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      volumeName(name),
+			Namespace: namespace,
+		},
+		Spec: v1.PersistentVolumeClaimSpec{
+			AccessModes:      []v1.PersistentVolumeAccessMode{accessMode},
+			StorageClassName: _storageClass,
+			Resources: v1.ResourceRequirements{
+				Requests: v1.ResourceList{
+					v1.ResourceStorage: resource.MustParse(size),
+				},
+			},
+		},
+	}
+}
+
+func volumeName(i string) string {
+	return dnsName(strings.Split(i, ":")[0])
+}