feat: Add pvc-for-tmp install arg to use PVC for server /tmp dir

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>
Signed-off-by: Scott Seago <sseago@redhat.com>

pkg/cmd/cli/install/install.go

@@ -90,6 +90,7 @@ type Options struct {
 	NodeAgentConfigMap              string
 	ItemBlockWorkerCount            int
 	ConcurrentBackups               int
+	PVCForTmp                       string
 	NodeAgentDisableHostPath        bool
 	kubeletRootDir                  string
 	ServerPriorityClassName         string
@@ -191,6 +192,12 @@ func (o *Options) BindFlags(flags *pflag.FlagSet) {
 		o.NodeAgentConfigMap,
 		"The name of ConfigMap containing node-agent configurations.",
 	)
+	flags.StringVar(
+		&o.PVCForTmp,
+		"pvc-for-tmp",
+		o.PVCForTmp,
+		"The name of PVC to be used as /tmp dir of Velero server pod. Optional.",
+	)
 	flags.IntVar(
 		&o.ItemBlockWorkerCount,
 		"item-block-worker-count",
@@ -321,6 +328,7 @@ func (o *Options) AsVeleroOptions() (*install.VeleroOptions, error) {
 		NodeAgentConfigMap:              o.NodeAgentConfigMap,
 		ItemBlockWorkerCount:            o.ItemBlockWorkerCount,
 		ConcurrentBackups:               o.ConcurrentBackups,
+		PVCForTmp:                       o.PVCForTmp,
 		KubeletRootDir:                  o.kubeletRootDir,
 		NodeAgentDisableHostPath:        o.NodeAgentDisableHostPath,
 		ServerPriorityClassName:         o.ServerPriorityClassName,