added email subscriptions

app/Mail/UpcomingWorkshops.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace App\Mail;
+
+use App\Models\Workshop;
+use App\Traits\HasUnsubscribeLink;
+use Illuminate\Bus\Queueable;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Support\Carbon;
+
+class UpcomingWorkshops extends Mailable
+{
+    use Queueable, SerializesModels, HasUnsubscribeLink;
+
+    public $subject;
+    public $email;
+    public $workshops;
+
+    public function __construct($email, $subject = 'Upcoming Workshops 🌟')
+    {
+        $this->subject = $subject;
+        $this->email = $email;
+        $this->workshops = $this->getUpcomingWorkshops();
+    }
+
+    private function getUpcomingWorkshops()
+    {
+        $startDate = Carbon::now()->addDays(3);
+        $endDate = Carbon::now()->addDays(42);
+
+        return Workshop::select('workshops.*', 'locations.name as location_name')
+            ->join('locations', 'workshops.location_id', '=', 'locations.id')
+            ->whereIn('workshops.status', ['open','scheduled'])
+            ->whereBetween('workshops.starts_at', [$startDate, $endDate])
+            ->where('locations.name', 'not like', '%private%')
+            ->orderBy('locations.name')
+            ->orderBy('workshops.starts_at')
+            ->get();
+    }
+
+    public function build()
+    {
+        // Bail if there are no upcoming workshops
+        if ($this->workshops->isEmpty()) {
+            return false;
+        }
+
+        return $this
+            ->subject($this->subject)
+            ->markdown('emails.upcoming-workshops')
+            ->with([
+                'email' => $this->email,
+                'workshops' => $this->workshops,
+                'unsubscribeLink' => $this->unsubscribeLink
+            ]);
+    }
+}