Adds a missing PHPUnit GitHub Actions workflow, fixes a fragile path extraction pattern inherited from issue #711, and resolves REUSE/php-cs CI failures.

PHPUnit workflow

• Added .github/workflows/phpunit.yml running composer run test:unit against PHP 8.2 / 8.3 / 8.4 on PR and push

Path handling fix (moveWithExclusions)

createBackup() had already been fixed for the explode()-splits-on-all-occurrences bug, but moveWithExclusions() had the identical pattern:

// Before — splits on every occurrence of $dataLocation in $path
// e.g. storage path ending in "nextcloud/" + file named "nextcloud.html" → wrong
$fileName = explode($dataLocation, $path)[1];

// After — always strips exactly the right prefix
$fileName = substr($path, strlen($dataLocation));

Regression tests for issue #711

• testRelativePathExtractionForIssue711() — pure logic test proving the old explode() returns a directory path instead of the file path for the exact bug-report scenario
• testCreateBackupCopiesNestedFilesCorrectly() — integration test: creates core/doc/admin/…/nextcloud.html, runs createBackup(), asserts the file is copied to the correct nested path with no double slashes

REUSE compliance

vendor-bin/phpunit/** was not covered by any annotation in REUSE.toml. Added it to the existing block that covers the other vendor-bin tool directories.

php-cs

Reformatted string concatenation in tests/unit/UpdaterTest.php from trailing-dot to leading-dot style as required by the project's php-cs-fixer config.

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