fix: enable mock for unit tests that use dummy docker

Unit tests that use dummy docker (not real Docker) need the mock enabled
because dummy docker doesn't create real images or OCI tars.

Without the mock, container extraction fails with 'No such image' error
when the test package has no image: config (which triggers extraction).

Tests fixed:
- TestBuildDockerDeps
- TestDockerPostProcessing

This resolves the CI unit test failures while keeping integration tests
using real extraction code.

Co-authored-by: Ona <[email protected]>

Author: leodido

pkg/leeway/build_test.go

@@ -118,6 +118,12 @@ func setupMockForUnitTests() func() {
 }
 
 func TestBuildDockerDeps(t *testing.T) {
+	// Enable mock for this test since it uses dummy docker (not real Docker)
+	// Without the mock, container extraction would fail because dummy docker
+	// doesn't create real images or OCI tars
+	restoreMock := setupMockForUnitTests()
+	defer restoreMock()
+
 	if *testutil.Dut {
 		pth, err := os.MkdirTemp("", "")
 		if err != nil {
@@ -548,6 +554,12 @@ func TestDockerPackage_BuildContextOverride(t *testing.T) {
 }
 
 func TestDockerPostProcessing(t *testing.T) {
+	// Enable mock for this test since it uses dummy docker (not real Docker)
+	// Without the mock, container extraction would fail because dummy docker
+	// doesn't create real images or OCI tars
+	restoreMock := setupMockForUnitTests()
+	defer restoreMock()
+
 	if *testutil.Dut {
 		pth, err := os.MkdirTemp("", "")
 		if err != nil {