feat(deployments): support Docker image tags for preview deployments

Add end-to-end support for `docker_registry_image_tag` in preview and deployment queue flows.

- Extend deploy API to accept `pull_request_id` alias and `docker_tag` for preview deploys
- Persist preview-specific Docker tags on `application_previews` and `application_deployment_queues`
- Pass tag through `queue_application_deployment()` and de-duplicate queued jobs by tag
- Update deployment job logic to resolve and use preview Docker tags for dockerimage build packs
- Update Livewire previews UI/state to manage per-preview tags and manual preview/tag inputs
- Add migration for new tag columns and model fillable/casts updates
- Add feature and unit tests covering API behavior and tag resolution

tests/Feature/DockerImagePreviewDeploymentApiTest.php

@@ -0,0 +1,146 @@
+<?php
+
+use App\Models\Application;
+use App\Models\ApplicationPreview;
+use App\Models\Environment;
+use App\Models\Project;
+use App\Models\Server;
+use App\Models\StandaloneDocker;
+use App\Models\Team;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Queue;
+use Illuminate\Support\Str;
+
+uses(RefreshDatabase::class);
+
+beforeEach(function () {
+    Queue::fake();
+
+    $this->team = Team::factory()->create();
+    $this->user = User::factory()->create();
+    $this->team->members()->attach($this->user->id, ['role' => 'owner']);
+
+    $plainTextToken = Str::random(40);
+    $token = $this->user->tokens()->create([
+        'name' => 'test-token',
+        'token' => hash('sha256', $plainTextToken),
+        'abilities' => ['*'],
+        'team_id' => $this->team->id,
+    ]);
+    $this->bearerToken = $token->getKey().'|'.$plainTextToken;
+
+    $this->server = Server::factory()->create(['team_id' => $this->team->id]);
+    $this->destination = StandaloneDocker::factory()->create([
+        'server_id' => $this->server->id,
+        'network' => 'coolify-'.Str::lower(Str::random(8)),
+    ]);
+    $this->project = Project::factory()->create(['team_id' => $this->team->id]);
+    $this->environment = Environment::factory()->create(['project_id' => $this->project->id]);
+});
+
+function createDockerImageApplication(Environment $environment, StandaloneDocker $destination): Application
+{
+    return Application::factory()->create([
+        'uuid' => (string) Str::uuid(),
+        'environment_id' => $environment->id,
+        'destination_id' => $destination->id,
+        'destination_type' => StandaloneDocker::class,
+        'build_pack' => 'dockerimage',
+        'docker_registry_image_name' => 'ghcr.io/coollabsio/example',
+        'docker_registry_image_tag' => 'latest',
+    ]);
+}
+
+test('it queues a docker image preview deployment and stores the preview tag', function () {
+    $application = createDockerImageApplication($this->environment, $this->destination);
+
+    $response = $this->withHeaders([
+        'Authorization' => 'Bearer '.$this->bearerToken,
+    ])->postJson('/api/v1/deploy', [
+        'uuid' => $application->uuid,
+        'pull_request_id' => 1234,
+        'docker_tag' => 'pr_1234',
+    ]);
+
+    $response->assertSuccessful();
+    $response->assertJsonPath('deployments.0.resource_uuid', $application->uuid);
+
+    $preview = ApplicationPreview::query()
+        ->where('application_id', $application->id)
+        ->where('pull_request_id', 1234)
+        ->first();
+
+    expect($preview)->not()->toBeNull();
+    expect($preview->docker_registry_image_tag)->toBe('pr_1234');
+
+    $deployment = $application->deployment_queue()->latest('id')->first();
+
+    expect($deployment)->not()->toBeNull();
+    expect($deployment->pull_request_id)->toBe(1234);
+    expect($deployment->docker_registry_image_tag)->toBe('pr_1234');
+});
+
+test('it updates an existing docker image preview tag when redeploying through the api', function () {
+    $application = createDockerImageApplication($this->environment, $this->destination);
+
+    ApplicationPreview::create([
+        'application_id' => $application->id,
+        'pull_request_id' => 99,
+        'pull_request_html_url' => '',
+        'docker_registry_image_tag' => 'pr_99_old',
+    ]);
+
+    $response = $this->withHeaders([
+        'Authorization' => 'Bearer '.$this->bearerToken,
+    ])->postJson('/api/v1/deploy', [
+        'uuid' => $application->uuid,
+        'pull_request_id' => 99,
+        'docker_tag' => 'pr_99_new',
+        'force' => true,
+    ]);
+
+    $response->assertSuccessful();
+
+    $preview = ApplicationPreview::query()
+        ->where('application_id', $application->id)
+        ->where('pull_request_id', 99)
+        ->first();
+
+    expect($preview->docker_registry_image_tag)->toBe('pr_99_new');
+});
+
+test('it rejects docker_tag without pull_request_id', function () {
+    $application = createDockerImageApplication($this->environment, $this->destination);
+
+    $response = $this->withHeaders([
+        'Authorization' => 'Bearer '.$this->bearerToken,
+    ])->postJson('/api/v1/deploy', [
+        'uuid' => $application->uuid,
+        'docker_tag' => 'pr_1234',
+    ]);
+
+    $response->assertStatus(400);
+    $response->assertJson(['message' => 'docker_tag requires pull_request_id.']);
+});
+
+test('it rejects docker_tag for non docker image applications', function () {
+    $application = Application::factory()->create([
+        'uuid' => (string) Str::uuid(),
+        'environment_id' => $this->environment->id,
+        'destination_id' => $this->destination->id,
+        'destination_type' => StandaloneDocker::class,
+        'build_pack' => 'nixpacks',
+    ]);
+
+    $response = $this->withHeaders([
+        'Authorization' => 'Bearer '.$this->bearerToken,
+    ])->postJson('/api/v1/deploy', [
+        'uuid' => $application->uuid,
+        'pull_request_id' => 7,
+        'docker_tag' => 'pr_7',
+    ]);
+
+    $response->assertSuccessful();
+    $response->assertJsonPath('deployments.0.message', 'docker_tag can only be used with Docker Image applications.');
+});