fix: allow period for label names

Author: robertcoltheart

src/GitVersion.Core/Core/RegexPatterns.cs

@@ -34,6 +34,9 @@ internal static partial class RegexPatterns
     [StringSyntax(StringSyntaxAttribute.Regex, Options)]
     internal const string SanitizeNameRegexPattern = "[^a-zA-Z0-9-]";
 
+    [StringSyntax(StringSyntaxAttribute.Regex, Options)]
+    internal const string SanitizeLabelRegexPattern = "[^a-zA-Z0-9-.]";
+
 #if NET9_0_OR_GREATER
     [GeneratedRegex(SwitchArgumentRegexPattern, Options)]
     public static partial Regex SwitchArgumentRegex { get; }

src/GitVersion.Core/Extensions/ConfigurationExtensions.cs

@@ -134,7 +134,7 @@ private static bool ShouldBeIgnored(ICommit commit, IIgnoreConfiguration ignore)
             var labelPlaceholders = BuildLabelPlaceholders(configuration.RegularExpression, effectiveBranchName);
 
             return label.FormatWith(labelPlaceholders, environment)
-                .RegexReplace(RegexPatterns.SanitizeNameRegexPattern, "-");
+                .RegexReplace(RegexPatterns.SanitizeLabelRegexPattern, "-");
         }
 
         public TaggedSemanticVersions GetTaggedSemanticVersion()