feat(k8s): k8s priority class name config (#5391)

docs/docs/30-administration/10-configuration/11-backends/20-kubernetes.md

@@ -404,3 +404,12 @@ Determines if containers must be required to run as non-root users.
 - Default: none
 
 Secret names to pull images from private repositories. See, how to [Pull an Image from a Private Registry](https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/).
+
+---
+
+### BACKEND_K8S_PRIORITY_CLASS
+
+- Name: `WOODPECKER_BACKEND_K8S_PRIORITY_CLASS`
+- Default: none, which will use the default priority class configured in Kubernetes
+
+Which [Kubernetes PriorityClass](https://kubernetes.io/docs/reference/kubernetes-api/workload-resources/priority-class-v1/) to assign to created job pods.

pipeline/backend/kubernetes/flags.go

@@ -95,4 +95,10 @@ var Flags = []cli.Flag{
 		Usage:   "whether to allow existing Kubernetes secrets to be referenced from steps",
 		Value:   false,
 	},
+	&cli.StringFlag{
+		Sources: cli.EnvVars("WOODPECKER_BACKEND_K8S_PRIORITY_CLASS"),
+		Name:    "backend-k8s-priority-class",
+		Usage:   "which kubernetes priority class to assign to created job pods",
+		Value:   "",
+	},
 }

pipeline/backend/kubernetes/kubernetes.go

@@ -70,6 +70,7 @@ type config struct {
 	ImagePullSecretNames        []string
 	SecurityContext             SecurityContextConfig
 	NativeSecretsAllowFromStep  bool
+	PriorityClassName           string
 }
 
 func (c *config) GetNamespace(orgID int64) string {
@@ -103,6 +104,7 @@ func configFromCliContext(ctx context.Context) (*config, error) {
 				StorageClass:                c.String("backend-k8s-storage-class"),
 				VolumeSize:                  c.String("backend-k8s-volume-size"),
 				StorageRwx:                  c.Bool("backend-k8s-storage-rwx"),
+				PriorityClassName:           c.String("backend-k8s-priority-class"),
 				PodLabels:                   make(map[string]string), // just init empty map to prevent nil panic
 				PodLabelsAllowFromStep:      c.Bool("backend-k8s-pod-labels-allow-from-step"),
 				PodAnnotations:              make(map[string]string), // just init empty map to prevent nil panic

pipeline/backend/kubernetes/pod.go

@@ -173,6 +173,7 @@ func podSpec(step *types.Step, config *config, options BackendOptions, nsp nativ
 		RestartPolicy:      v1.RestartPolicyNever,
 		RuntimeClassName:   options.RuntimeClassName,
 		ServiceAccountName: options.ServiceAccountName,
+		PriorityClassName:  config.PriorityClassName,
 		HostAliases:        hostAliases(step.ExtraHosts),
 		NodeSelector:       nodeSelector(options.NodeSelector, config.PodNodeSelector, step.Environment["CI_SYSTEM_PLATFORM"]),
 		Tolerations:        tolerations(options.Tolerations),