improves configuration file loading logs

Updates logging messages for configuration file loading to provide more clarity and consistency.

Now it logs when:
- Default configuration is used
- Configuration file is not found
- Configuration file is being used

Author: arturcic

src/GitVersion.Configuration.Tests/Configuration/ConfigurationFileLocatorTests.cs

@@ -222,7 +222,7 @@ public void NoWarnOnCustomYmlFile()
             var configurationProvider = (ConfigurationProvider)sp.GetRequiredService<IConfigurationProvider>();
 
             configurationProvider.ProvideForDirectory(this.repoPath);
-            stringLogger.Length.ShouldBe(0);
+            stringLogger.ShouldMatch("No configuration file found, using default configuration");
         }
 
         [Test]
@@ -244,7 +244,7 @@ public void NoWarnOnCustomYmlFileOutsideRepoPath()
             var configurationProvider = (ConfigurationProvider)sp.GetRequiredService<IConfigurationProvider>();
 
             configurationProvider.ProvideForDirectory(this.repoPath);
-            stringLogger.Length.ShouldBe(0);
+            stringLogger.ShouldMatch("No configuration file found, using default configuration");
         }
 
         [Test]

src/GitVersion.Configuration.Tests/Configuration/ConfigurationProviderTests.cs

@@ -287,7 +287,7 @@ public void NoWarnOnGitVersionYmlFile()
         this.configurationProvider.ProvideForDirectory(this.repoPath);
 
         var filePath = PathHelper.Combine(this.repoPath, ConfigurationFileLocator.DefaultFileName);
-        stringLogger.ShouldContain($"Found configuration file at '{filePath}'");
+        stringLogger.ShouldContain($"Using configuration file '{filePath}'");
     }
 
     [Test]

src/GitVersion.Configuration/ConfigurationFileLocator.cs

@@ -43,6 +43,7 @@ public void Verify(string? workingDirectory, string? projectRootDirectory)
         string? customConfigurationFile = GetCustomConfigurationFilePathIfEligable(directoryPath);
         if (!string.IsNullOrWhiteSpace(customConfigurationFile))
         {
+            this.log.Info($"Found configuration file at '{customConfigurationFile}'");
             return customConfigurationFile;
         }
 

src/GitVersion.Configuration/ConfigurationProvider.cs

@@ -1,6 +1,7 @@
 using System.IO.Abstractions;
 using GitVersion.Configuration.Workflows;
 using GitVersion.Extensions;
+using GitVersion.Logging;
 using Microsoft.Extensions.Options;
 using YamlDotNet.Core;
 
@@ -9,12 +10,14 @@ namespace GitVersion.Configuration;
 internal class ConfigurationProvider(
     IConfigurationFileLocator configFileLocator,
     IFileSystem fileSystem,
+    ILog log,
     IConfigurationSerializer configurationSerializer,
     IOptions<GitVersionOptions> options)
     : IConfigurationProvider
 {
     private readonly IConfigurationFileLocator configFileLocator = configFileLocator.NotNull();
     private readonly IFileSystem fileSystem = fileSystem.NotNull();
+    private readonly ILog log = log.NotNull();
     private readonly IConfigurationSerializer configurationSerializer = configurationSerializer.NotNull();
     private readonly IOptions<GitVersionOptions> options = options.NotNull();
 
@@ -72,7 +75,19 @@ private IGitVersionConfiguration ProvideConfiguration(string? configFile,
 
     private IReadOnlyDictionary<object, object?>? ReadOverrideConfiguration(string? configFilePath)
     {
-        if (configFilePath == null || !fileSystem.File.Exists(configFilePath)) return null;
+        if (configFilePath == null)
+        {
+            this.log.Info("No configuration file found, using default configuration");
+            return null;
+        }
+
+        if (!this.fileSystem.File.Exists(configFilePath))
+        {
+            this.log.Info($"Configuration file '{configFilePath}' not found");
+            return null;
+        }
+
+        this.log.Info($"Using configuration file '{configFilePath}'");
         var content = fileSystem.File.ReadAllText(configFilePath);
         return configurationSerializer.Deserialize<Dictionary<object, object?>>(content);
     }