feat(build): Create helpers and TagCommit step

- adjust the BaseSourceLocation to be absolute
- refactor getting the PowershellModule version to Helpers.cs

build/Helpers.cs

@@ -0,0 +1,42 @@
+using System.Diagnostics;
+using System.IO;
+using System.Text.RegularExpressions;
+
+namespace Build;
+
+public class Helpers
+{
+	public static string GetPowershellModuleVersion(string powershelModuleOutputLocation)
+	{
+		var moduleVersionInfo = FileVersionInfo.GetVersionInfo(Path.Combine(powershelModuleOutputLocation, "PowershellModule.dll"));
+
+		// It's (almost) impossible to not have a product version tag here. There is a reason why the implementation
+		// returns a string? but I can't find it and I don't really care too much. If we have null return an empty string
+		// and append no version to the archive bundle.
+		if (moduleVersionInfo.ProductVersion == null)
+		{
+			return string.Empty;
+		}
+
+		var versionRegex = new Regex(@"(\d+\.\d+\.\d+)(?:\-?([\w\-]+)\+?(\w+)?)?");
+		var match = versionRegex.Match(moduleVersionInfo.ProductVersion);
+		if (match.Success)
+		{
+			// If we have 4 groups, we've got a version number, suffix, and commit hash, so we return the first 2 as is
+			// and the commit has capped to 8 characters
+			if (match.Groups.Count == 4)
+			{
+				return $"{match.Groups[1]}-{match.Groups[2]}+{match.Groups[3].Value.Substring(0, 8)}";
+			}
+
+			if (match.Groups.Count == 3)
+			{
+				return $"{match.Groups[1]}-{match.Groups[2]}";
+			}
+
+			return $"{match.Groups[1]}";
+		}
+
+		return string.Empty;
+	}
+}