Allow disabling /runner emptydir mounts and setting storage volume (#674)

* Allow disabling /runner emptydir mounts

* Support defining storage medium for emptydirs

* Fix typos

api/v1alpha1/runner_types.go

@@ -69,6 +69,8 @@ type RunnerConfig struct {
 	DockerRegistryMirror *string `json:"dockerRegistryMirror,omitempty"`
 	// +optional
 	VolumeSizeLimit *resource.Quantity `json:"volumeSizeLimit,omitempty"`
+	// +optional
+	VolumeStorageMedium *string `json:"volumeStorageMedium,omitempty"`
 }
 
 // RunnerPodSpec defines the desired pod spec fields of the runner pod

api/v1alpha1/zz_generated.deepcopy.go

@@ -408,6 +408,11 @@ func (in *RunnerConfig) DeepCopyInto(out *RunnerConfig) {
 		x := (*in).DeepCopy()
 		*out = &x
 	}
+	if in.VolumeStorageMedium != nil {
+		in, out := &in.VolumeStorageMedium, &out.VolumeStorageMedium
+		*out = new(string)
+		**out = **in
+	}
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new RunnerConfig.