### Changes

Fixes #3: Error on DBI when files or folders contains special characters.

### Additional changes
* Added unit and feature tests
* Fix file size display
* Run tests on CI/CD
* Publish docker image on release

www/tests/Unit/FileSizeTest.php

@@ -0,0 +1,32 @@
+<?php
+
+use App\Helpers\FileSize;
+
+test('formats zero bytes as "0"', function () {
+    expect(FileSize::format(0))->toBe('0');
+});
+
+test('formats byte values without decimal places', function () {
+    expect(FileSize::format(1))->toBe('1');
+    expect(FileSize::format(512))->toBe('512');
+    expect(FileSize::format(1001))->toBe('1001');
+    expect(FileSize::format(1023))->toBe('1023');
+});
+
+test('formats kilobytes', function () {
+    expect(FileSize::format(1024))->toBe('1.00K');
+    expect(FileSize::format(1536))->toBe('1.50K');
+});
+
+test('formats megabytes', function () {
+    expect(FileSize::format(1024 * 1024))->toBe('1.00M');
+    expect(FileSize::format((int) (1.5 * 1024 * 1024)))->toBe('1.50M');
+});
+
+test('formats gigabytes', function () {
+    expect(FileSize::format(1024 * 1024 * 1024))->toBe('1.00G');
+});
+
+test('formats terabytes', function () {
+    expect(FileSize::format(1024 * 1024 * 1024 * 1024))->toBe('1.00T');
+});