Implement Keystone environment deployments

app/Models/Environment.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\SchedulerMode;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\MorphMany;
+
+class Environment extends Model
+{
+    use HasFactory;
+
+    protected $guarded = [];
+
+    protected function casts(): array
+    {
+        return [
+            'scheduler_enabled' => 'boolean',
+            'scheduler_mode' => SchedulerMode::class,
+            'build_config' => 'array',
+        ];
+    }
+
+    public function application(): BelongsTo
+    {
+        return $this->belongsTo(Application::class);
+    }
+
+    public function services(): HasMany
+    {
+        return $this->hasMany(Service::class);
+    }
+
+    public function attachments(): HasMany
+    {
+        return $this->hasMany(EnvironmentAttachment::class);
+    }
+
+    public function variables(): HasMany
+    {
+        return $this->hasMany(EnvironmentVariable::class);
+    }
+
+    public function buildArtifacts(): HasMany
+    {
+        return $this->hasMany(BuildArtifact::class);
+    }
+
+    public function operations(): MorphMany
+    {
+        return $this->morphMany(Operation::class, 'target');
+    }
+}