Add OSVersion to platform protobuf

It also extends the functions in api/types/platform_helpers.go

Signed-off-by: kiashok <[email protected]>

Author: kiashok

api/next.pb.txt

@@ -881,6 +881,13 @@ file {
       type: TYPE_STRING
       json_name: "variant"
     }
+    field {
+      name: "os_version"
+      number: 4
+      label: LABEL_OPTIONAL
+      type: TYPE_STRING
+      json_name: "osVersion"
+    }
   }
   options {
     go_package: "github.com/containerd/containerd/v2/api/types;types"

api/types/platform.pb.go

@@ -26,4 +26,5 @@ message Platform {
 	string os = 1;
 	string architecture = 2;
 	string variant = 3;
+	string os_version = 4;
 }

api/types/platform.proto

@@ -25,6 +25,7 @@ func OCIPlatformToProto(platforms []oci.Platform) []*Platform {
 	for i := range platforms {
 		ap[i] = &Platform{
 			OS:           platforms[i].OS,
+			OSVersion:    platforms[i].OSVersion,
 			Architecture: platforms[i].Architecture,
 			Variant:      platforms[i].Variant,
 		}
@@ -39,6 +40,7 @@ func OCIPlatformFromProto(platforms []*Platform) []oci.Platform {
 	for i := range platforms {
 		op[i] = oci.Platform{
 			OS:           platforms[i].OS,
+			OSVersion:    platforms[i].OSVersion,
 			Architecture: platforms[i].Architecture,
 			Variant:      platforms[i].Variant,
 		}