Implement Keystone environment deployments

app/Http/Controllers/EnvironmentMigrationController.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Actions\Environments\CreateMigrationOperation;
+use App\Models\Organisation;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+
+class EnvironmentMigrationController extends Controller
+{
+    public function store(Request $request): RedirectResponse
+    {
+        $organisation = Organisation::findOrFail($request->route('organisation'));
+        $application = $organisation->applications()->findOrFail($request->route('application'));
+        $environment = $application->environments()->findOrFail($request->route('environment'));
+
+        app(CreateMigrationOperation::class)->execute($environment);
+
+        return redirect()
+            ->route('applications.show', ['organisation' => $organisation->id, 'application' => $application->id])
+            ->with('success', 'Migration operation created.');
+    }
+}