Cap arm64 v8 variants at v8.9

Signed-off-by: Chongyi Zheng <[email protected]>

compare.go

@@ -97,8 +97,11 @@ func platformVector(platform specs.Platform) []specs.Platform {
 					})
 				}
 
-				// v9.0 diverged from v8.5, meaning that v9.x is compatible with v8.{x+5}
+				// v9.0 diverged from v8.5, meaning that v9.x is compatible with v8.{x+5} until v9.4/v8.9
 				armMinor = armMinor + 5
+				if armMinor > 9 {
+					armMinor = 9
+				}
 				armMajor = 8
 				vector = append(vector, specs.Platform{
 					Architecture: platform.Architecture,

compare_test.go

@@ -185,6 +185,44 @@ func TestOnly(t *testing.T) {
 				},
 			},
 		},
+		{
+			platform: "linux/arm64/v9.6",
+			matches: map[bool][]string{
+				true: {
+					"linux/arm",
+					"linux/arm/v5",
+					"linux/arm/v6",
+					"linux/arm/v7",
+					"linux/arm/v8",
+					"linux/arm64",
+					"linux/arm64/v8",
+					"linux/arm64/v8.1",
+					"linux/arm64/v8.2",
+					"linux/arm64/v8.3",
+					"linux/arm64/v8.4",
+					"linux/arm64/v8.5",
+					"linux/arm64/v8.6",
+					"linux/arm64/v8.7",
+					"linux/arm64/v8.8",
+					"linux/arm64/v8.9",
+					"linux/arm64/v9",
+					"linux/arm64/v9.0",
+					"linux/arm64/v9.1",
+					"linux/arm64/v9.2",
+					"linux/arm64/v9.3",
+					"linux/arm64/v9.4",
+					"linux/arm64/v9.5",
+					"linux/arm64/v9.6",
+				},
+				false: {
+					"linux/amd64",
+					"linux/arm/v4",
+					"windows/amd64",
+					"windows/arm",
+					"linux/arm64/v8.10", // there's no v8.10
+				},
+			},
+		},
 		{
 			platform: "linux/arm64/v9",
 			matches: map[bool][]string{