Merge pull request #41931 from jessfraz/pip

Automatic merge from submit-queue (batch tested with PRs 41931, 39821, 41841, 42197, 42195)

Admission Controller: Add Pod Preset

Based off the proposal in https://github.com/kubernetes/community/pull/254

cc @pmorie @pwittrock 

TODO:
- [ ] tests



**What this PR does / why we need it**: Implements the Pod Injection Policy admission controller

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
Added new Api `PodPreset` to enable defining cross-cutting injection of Volumes and Environment into Pods.
```

pkg/generated/openapi/zz_generated.openapi.go

@@ -17691,6 +17691,155 @@ func GetOpenAPIDefinitions(ref openapi.ReferenceCallback) map[string]openapi.Ope
 			},
 			Dependencies: []string{},
 		},
+		"k8s.io/kubernetes/pkg/apis/settings/v1alpha1.PodPreset": {
+			Schema: spec.Schema{
+				SchemaProps: spec.SchemaProps{
+					Description: "PodPreset is a policy resource that defines additional runtime requirements for a Pod.",
+					Properties: map[string]spec.Schema{
+						"kind": {
+							SchemaProps: spec.SchemaProps{
+								Description: "Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: http://releases.k8s.io/HEAD/docs/devel/api-conventions.md#types-kinds",
+								Type:        []string{"string"},
+								Format:      "",
+							},
+						},
+						"apiVersion": {
+							SchemaProps: spec.SchemaProps{
+								Description: "APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: http://releases.k8s.io/HEAD/docs/devel/api-conventions.md#resources",
+								Type:        []string{"string"},
+								Format:      "",
+							},
+						},
+						"metadata": {
+							SchemaProps: spec.SchemaProps{
+								Ref: ref("k8s.io/apimachinery/pkg/apis/meta/v1.ObjectMeta"),
+							},
+						},
+						"spec": {
+							SchemaProps: spec.SchemaProps{
+								Ref: ref("k8s.io/kubernetes/pkg/apis/settings/v1alpha1.PodPresetSpec"),
+							},
+						},
+					},
+				},
+			},
+			Dependencies: []string{
+				"k8s.io/apimachinery/pkg/apis/meta/v1.ObjectMeta", "k8s.io/kubernetes/pkg/apis/settings/v1alpha1.PodPresetSpec"},
+		},
+		"k8s.io/kubernetes/pkg/apis/settings/v1alpha1.PodPresetList": {
+			Schema: spec.Schema{
+				SchemaProps: spec.SchemaProps{
+					Description: "PodPresetList is a list of PodPreset objects.",
+					Properties: map[string]spec.Schema{
+						"kind": {
+							SchemaProps: spec.SchemaProps{
+								Description: "Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: http://releases.k8s.io/HEAD/docs/devel/api-conventions.md#types-kinds",
+								Type:        []string{"string"},
+								Format:      "",
+							},
+						},
+						"apiVersion": {
+							SchemaProps: spec.SchemaProps{
+								Description: "APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: http://releases.k8s.io/HEAD/docs/devel/api-conventions.md#resources",
+								Type:        []string{"string"},
+								Format:      "",
+							},
+						},
+						"metadata": {
+							SchemaProps: spec.SchemaProps{
+								Description: "Standard list metadata. More info: http://releases.k8s.io/HEAD/docs/devel/api-conventions.md#metadata",
+								Ref:         ref("k8s.io/apimachinery/pkg/apis/meta/v1.ListMeta"),
+							},
+						},
+						"items": {
+							SchemaProps: spec.SchemaProps{
+								Description: "Items is a list of schema objects.",
+								Type:        []string{"array"},
+								Items: &spec.SchemaOrArray{
+									Schema: &spec.Schema{
+										SchemaProps: spec.SchemaProps{
+											Ref: ref("k8s.io/kubernetes/pkg/apis/settings/v1alpha1.PodPreset"),
+										},
+									},
+								},
+							},
+						},
+					},
+					Required: []string{"items"},
+				},
+			},
+			Dependencies: []string{
+				"k8s.io/apimachinery/pkg/apis/meta/v1.ListMeta", "k8s.io/kubernetes/pkg/apis/settings/v1alpha1.PodPreset"},
+		},
+		"k8s.io/kubernetes/pkg/apis/settings/v1alpha1.PodPresetSpec": {
+			Schema: spec.Schema{
+				SchemaProps: spec.SchemaProps{
+					Description: "PodPresetSpec is a description of a pod injection policy.",
+					Properties: map[string]spec.Schema{
+						"selector": {
+							SchemaProps: spec.SchemaProps{
+								Description: "Selector is a label query over a set of resources, in this case pods. Required.",
+								Ref:         ref("k8s.io/apimachinery/pkg/apis/meta/v1.LabelSelector"),
+							},
+						},
+						"env": {
+							SchemaProps: spec.SchemaProps{
+								Description: "Env defines the collection of EnvVar to inject into containers.",
+								Type:        []string{"array"},
+								Items: &spec.SchemaOrArray{
+									Schema: &spec.Schema{
+										SchemaProps: spec.SchemaProps{
+											Ref: ref("k8s.io/kubernetes/pkg/api/v1.EnvVar"),
+										},
+									},
+								},
+							},
+						},
+						"envFrom": {
+							SchemaProps: spec.SchemaProps{
+								Description: "EnvFrom defines the collection of EnvFromSource to inject into containers.",
+								Type:        []string{"array"},
+								Items: &spec.SchemaOrArray{
+									Schema: &spec.Schema{
+										SchemaProps: spec.SchemaProps{
+											Ref: ref("k8s.io/kubernetes/pkg/api/v1.EnvFromSource"),
+										},
+									},
+								},
+							},
+						},
+						"volumes": {
+							SchemaProps: spec.SchemaProps{
+								Description: "Volumes defines the collection of Volume to inject into the pod.",
+								Type:        []string{"array"},
+								Items: &spec.SchemaOrArray{
+									Schema: &spec.Schema{
+										SchemaProps: spec.SchemaProps{
+											Ref: ref("k8s.io/kubernetes/pkg/api/v1.Volume"),
+										},
+									},
+								},
+							},
+						},
+						"volumeMounts": {
+							SchemaProps: spec.SchemaProps{
+								Description: "VolumeMounts defines the collection of VolumeMount to inject into containers.",
+								Type:        []string{"array"},
+								Items: &spec.SchemaOrArray{
+									Schema: &spec.Schema{
+										SchemaProps: spec.SchemaProps{
+											Ref: ref("k8s.io/kubernetes/pkg/api/v1.VolumeMount"),
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+			Dependencies: []string{
+				"k8s.io/apimachinery/pkg/apis/meta/v1.LabelSelector", "k8s.io/kubernetes/pkg/api/v1.EnvFromSource", "k8s.io/kubernetes/pkg/api/v1.EnvVar", "k8s.io/kubernetes/pkg/api/v1.Volume", "k8s.io/kubernetes/pkg/api/v1.VolumeMount"},
+		},
 		"k8s.io/kubernetes/pkg/apis/storage/v1beta1.StorageClass": {
 			Schema: spec.Schema{
 				SchemaProps: spec.SchemaProps{