feat(environment): introduce 'is_buildtime_only' attribute to environment variables for improved build-time configuration

app/Models/EnvironmentVariable.php

@@ -17,6 +17,7 @@ use OpenApi\Attributes as OA;
         'is_literal' => ['type' => 'boolean'],
         'is_multiline' => ['type' => 'boolean'],
         'is_preview' => ['type' => 'boolean'],
+        'is_buildtime_only' => ['type' => 'boolean'],
         'is_shared' => ['type' => 'boolean'],
         'is_shown_once' => ['type' => 'boolean'],
         'key' => ['type' => 'string'],
@@ -36,6 +37,7 @@ class EnvironmentVariable extends BaseModel
         'value' => 'encrypted',
         'is_multiline' => 'boolean',
         'is_preview' => 'boolean',
+        'is_buildtime_only' => 'boolean',
         'version' => 'string',
         'resourceable_type' => 'string',
         'resourceable_id' => 'integer',