fix: application rollback uses correct commit sha

- setGitImportSettings() now accepts optional $commit parameter
 - Uses passed commit over application's git_commit_sha (typically HEAD)
 - Fixes rollback deploying latest instead of selected commit
 - Also fixes shallow clone "bad object" error on rollback

Fixes #8445

tests/Feature/ApplicationRollbackTest.php

@@ -0,0 +1,55 @@
+<?php
+
+use App\Models\Application;
+use App\Models\ApplicationSetting;
+use App\Models\Environment;
+use App\Models\Project;
+use App\Models\Server;
+use App\Models\Team;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+
+uses(RefreshDatabase::class);
+
+describe('Application Rollback', function () {
+    test('setGitImportSettings uses passed commit instead of application git_commit_sha', function () {
+        $team = Team::factory()->create();
+        $project = Project::create([
+            'team_id' => $team->id,
+            'name' => 'Test Project',
+            'uuid' => (string) str()->uuid(),
+        ]);
+        $environment = Environment::create([
+            'project_id' => $project->id,
+            'name' => 'rollback-test-env',
+            'uuid' => (string) str()->uuid(),
+        ]);
+        $server = Server::factory()->create(['team_id' => $team->id]);
+
+        // Create application with git_commit_sha = 'HEAD' (default - use latest)
+        $application = Application::factory()->create([
+            'environment_id' => $environment->id,
+            'destination_id' => $server->id,
+            'git_commit_sha' => 'HEAD',
+        ]);
+
+        // Create application settings
+        ApplicationSetting::create([
+            'application_id' => $application->id,
+            'is_git_shallow_clone_enabled' => false,
+        ]);
+
+        // The rollback commit SHA we want to deploy
+        $rollbackCommit = 'abc123def456';
+
+        // This should use the passed commit, not the application's git_commit_sha
+        $result = $application->setGitImportSettings(
+            deployment_uuid: 'test-uuid',
+            git_clone_command: 'git clone',
+            public: true,
+            commit: $rollbackCommit
+        );
+
+        // Assert: The command should checkout the ROLLBACK commit
+        expect($result)->toContain($rollbackCommit);
+    });
+});