feat: Allow skipping MAIL_HOST environment variable validation during build processes using SKIP_RUNTIME_ENV_VALIDATION.

lib/env.test.ts

@@ -57,4 +57,14 @@ describe('envSchema', () => {
     });
     expect(result.success).toBe(true);
   });
+
+  it('should skip MAIL_HOST requirement if SKIP_RUNTIME_ENV_VALIDATION is true', () => {
+    process.env.SKIP_RUNTIME_ENV_VALIDATION = 'true';
+    const result = envSchema.safeParse({
+      NEXT_PUBLIC_BASE_URL: 'https://example.com',
+      TARGET: 'production',
+    });
+    expect(result.success).toBe(true);
+    delete process.env.SKIP_RUNTIME_ENV_VALIDATION;
+  });
 });