test: randomize MAC addresses used in the unit-tests

The theory is that makes the unit-test flaky for network controllers.

Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>

Author: smira

.conform.yaml

@@ -1,6 +1,6 @@
 # THIS FILE WAS AUTOMATICALLY GENERATED, PLEASE DO NOT EDIT.
 #
-# Generated on 2025-09-02T13:10:04Z by kres 784fa1f.
+# Generated on 2025-11-13T15:58:14Z by kres e1d6dac.
 
 policies:
   - type: commit
@@ -12,7 +12,7 @@ policies:
           gitHubOrganization: siderolabs
       spellcheck:
         locale: US
-      maximumOfOneCommit: true
+      maximumOfOneCommit: false
       header:
         length: 89
         imperative: true

internal/app/machined/pkg/controllers/network/link_spec_test.go

@@ -74,7 +74,7 @@ func (suite *LinkSpecSuite) TestDummy() {
 		suite.Create(res)
 	}
 
-	newHardwareAddr := net.HardwareAddr{0x2e, 0x3c, 0x4d, 0x5e, 0x6f, 0x70}
+	newHardwareAddr := net.HardwareAddr{0x02, 0x00, 0x00, 0x00, byte(rand.IntN(256)), byte(rand.IntN(256))}
 
 	ctest.AssertResource(suite, dummyInterface, func(r *network.LinkStatus, asrt *assert.Assertions) {
 		asrt.Equal("dummy", r.TypedSpec().Kind)
@@ -102,7 +102,7 @@ func (suite *LinkSpecSuite) TestDummy() {
 func (suite *LinkSpecSuite) TestDummyWithMAC() {
 	dummyInterface := suite.uniqueDummyInterface()
 
-	newHardwareAddr := net.HardwareAddr{0x2e, 0x3c, 0x4d, 0x5e, 0x6f, 0x70}
+	newHardwareAddr := net.HardwareAddr{0x02, 0x00, 0x00, 0x00, byte(rand.IntN(256)), byte(rand.IntN(256))}
 
 	dummy := network.NewLinkSpec(network.NamespaceName, dummyInterface)
 	*dummy.TypedSpec() = network.LinkSpecSpec{