TASK: Support pre-release tags in next release tag calculation

The calculation of the next version with a pre-release suffix in the
current version failed, e.g. the calculation of the next patch version
1.2.2 for the current pre-release version 1.2.1-p1.

build/classes/SemanticVersioning.php

@@ -11,7 +11,11 @@ class SemanticVersioning
     public function getNextReleaseTag($tag, $releaseType)
     {
         $tagPrefix = substr($tag, 0, strcspn($tag, '0123456789'));
-        $tagVersion = substr($tag, strlen($tagPrefix));
+        if (($tagSuffixPos = strpos($tag, '-')) !== false) {
+            $tagVersion = substr($tag, strlen($tagPrefix), $tagSuffixPos);
+        } else {
+            $tagVersion = substr($tag, strlen($tagPrefix));
+        }
         $tagVersionParts = explode('.', $tagVersion);
         $releaseVersionParts = $tagVersionParts + [0, 0, 0];
         $releaseVersionParts = array_slice($releaseVersionParts, 0, $releaseType + 1);

tests/build/SemanticVersioningTest.php

@@ -37,6 +37,7 @@ public function getNextReleaseTagDataProvider()
             ['1', SemanticVersioning::MINOR_RELEASE, '1.1'],
             ['1', SemanticVersioning::MAJOR_RELEASE, '2'],
             ['v1.0.1', SemanticVersioning::PATCH_RELEASE, 'v1.0.2'],
+            ['1.0.1-p1', SemanticVersioning::PATCH_RELEASE, '1.0.2'],
         ];
     }