Fix tests on arm64 and ppc64le (#7500)

Signed-off-by: Yaakov Selkowitz <yselkowi@redhat.com>

pkg/plugin/plugin_test.go

@@ -87,6 +87,8 @@ func TestPlatformPrepareCommand(t *testing.T) {
 			PlatformCommand: []PlatformCommand{
 				{OperatingSystem: "linux", Architecture: "i386", Command: "echo -n linux-i386"},
 				{OperatingSystem: "linux", Architecture: "amd64", Command: "echo -n linux-amd64"},
+				{OperatingSystem: "linux", Architecture: "arm64", Command: "echo -n linux-arm64"},
+				{OperatingSystem: "linux", Architecture: "ppc64le", Command: "echo -n linux-ppc64le"},
 				{OperatingSystem: "linux", Architecture: "s390x", Command: "echo -n linux-s390x"},
 				{OperatingSystem: "windows", Architecture: "amd64", Command: "echo -n win-64"},
 			},
@@ -99,6 +101,10 @@ func TestPlatformPrepareCommand(t *testing.T) {
 		osStrCmp = "linux-i386"
 	} else if os == "linux" && arch == "amd64" {
 		osStrCmp = "linux-amd64"
+	} else if os == "linux" && arch == "arm64" {
+		osStrCmp = "linux-arm64"
+	} else if os == "linux" && arch == "ppc64le" {
+		osStrCmp = "linux-ppc64le"
 	} else if os == "linux" && arch == "s390x" {
 		osStrCmp = "linux-s390x"
 	} else if os == "windows" && arch == "amd64" {