refactor(jobs): extract container resolution logic for deployment commands

Extract common container selection logic into resolveCommandContainer() method
that handles both single and multi-container app scenarios. This consolidates
duplicated code from run_pre_deployment_command() and run_post_deployment_command()
while improving error messaging and test coverage.

tests/Feature/DeploymentCommandContainerResolutionTest.php

@@ -0,0 +1,116 @@
+<?php
+
+use App\Jobs\ApplicationDeploymentJob;
+use App\Models\Application;
+use App\Models\ApplicationDeploymentQueue;
+
+function createJobWithProperties(string $uuid): object
+{
+    $ref = new ReflectionClass(ApplicationDeploymentJob::class);
+    $instance = $ref->newInstanceWithoutConstructor();
+
+    $app = Mockery::mock(Application::class)->makePartial();
+    $app->uuid = $uuid;
+
+    $queue = Mockery::mock(ApplicationDeploymentQueue::class)->makePartial();
+    $queue->shouldReceive('addLogEntry')->andReturnNull();
+
+    $appProp = $ref->getProperty('application');
+    $appProp->setAccessible(true);
+    $appProp->setValue($instance, $app);
+
+    $queueProp = $ref->getProperty('application_deployment_queue');
+    $queueProp->setAccessible(true);
+    $queueProp->setValue($instance, $queue);
+
+    return $instance;
+}
+
+function invokeResolve(object $instance, $containers, ?string $specifiedName, string $type): ?array
+{
+    $ref = new ReflectionClass(ApplicationDeploymentJob::class);
+    $method = $ref->getMethod('resolveCommandContainer');
+    $method->setAccessible(true);
+
+    return $method->invoke($instance, $containers, $specifiedName, $type);
+}
+
+describe('resolveCommandContainer', function () {
+    test('returns null when no containers exist', function () {
+        $instance = createJobWithProperties('abc123');
+        $result = invokeResolve($instance, collect([]), 'web', 'Pre-deployment');
+
+        expect($result)->toBeNull();
+    });
+
+    test('returns the sole container when only one exists', function () {
+        $container = ['Names' => 'web-abc123', 'Labels' => ''];
+        $instance = createJobWithProperties('abc123');
+        $result = invokeResolve($instance, collect([$container]), null, 'Pre-deployment');
+
+        expect($result)->toBe($container);
+    });
+
+    test('returns the sole container regardless of specified name when only one exists', function () {
+        $container = ['Names' => 'web-abc123', 'Labels' => ''];
+        $instance = createJobWithProperties('abc123');
+        $result = invokeResolve($instance, collect([$container]), 'wrong-name', 'Pre-deployment');
+
+        expect($result)->toBe($container);
+    });
+
+    test('returns null when no container name specified for multi-container app', function () {
+        $containers = collect([
+            ['Names' => 'web-abc123', 'Labels' => ''],
+            ['Names' => 'worker-abc123', 'Labels' => ''],
+        ]);
+        $instance = createJobWithProperties('abc123');
+        $result = invokeResolve($instance, $containers, null, 'Pre-deployment');
+
+        expect($result)->toBeNull();
+    });
+
+    test('returns null when empty string container name for multi-container app', function () {
+        $containers = collect([
+            ['Names' => 'web-abc123', 'Labels' => ''],
+            ['Names' => 'worker-abc123', 'Labels' => ''],
+        ]);
+        $instance = createJobWithProperties('abc123');
+        $result = invokeResolve($instance, $containers, '', 'Pre-deployment');
+
+        expect($result)->toBeNull();
+    });
+
+    test('matches correct container by specified name in multi-container app', function () {
+        $containers = collect([
+            ['Names' => 'web-abc123', 'Labels' => ''],
+            ['Names' => 'worker-abc123', 'Labels' => ''],
+        ]);
+        $instance = createJobWithProperties('abc123');
+        $result = invokeResolve($instance, $containers, 'worker', 'Pre-deployment');
+
+        expect($result)->toBe(['Names' => 'worker-abc123', 'Labels' => '']);
+    });
+
+    test('returns null when specified container name does not match any container', function () {
+        $containers = collect([
+            ['Names' => 'web-abc123', 'Labels' => ''],
+            ['Names' => 'worker-abc123', 'Labels' => ''],
+        ]);
+        $instance = createJobWithProperties('abc123');
+        $result = invokeResolve($instance, $containers, 'nonexistent', 'Pre-deployment');
+
+        expect($result)->toBeNull();
+    });
+
+    test('matches container with PR suffix', function () {
+        $containers = collect([
+            ['Names' => 'web-abc123-pr-42', 'Labels' => ''],
+            ['Names' => 'worker-abc123-pr-42', 'Labels' => ''],
+        ]);
+        $instance = createJobWithProperties('abc123');
+        $result = invokeResolve($instance, $containers, 'web', 'Pre-deployment');
+
+        expect($result)->toBe(['Names' => 'web-abc123-pr-42', 'Labels' => '']);
+    });
+});