Add option to allow updating published release

Author: arturcic

Source/GitReleaseManager/Configuration/Config.cs

@@ -32,6 +32,7 @@ public Config()
                 IncludeShaSection = false,
                 ShaSectionHeading = "SHA256 Hashes of the release artifacts",
                 ShaSectionLineFormat = "- `{1}\t{0}`",
+                AllowUpdatePublishedRelease = false,
             };
 
             Export = new ExportConfig

Source/GitReleaseManager/Configuration/CreateConfig.cs

@@ -38,5 +38,8 @@ public class CreateConfig
 
         [YamlMember(Alias = "sha-section-line-format")]
         public string ShaSectionLineFormat { get; set; }
+
+        [YamlMember(Alias = "allow-update-published")]
+        public bool AllowUpdatePublishedRelease { get; set; }
     }
 }

Source/GitReleaseManager/GitHubProvider.cs

@@ -153,7 +153,7 @@ public async Task<Release> CreateReleaseFromMilestone(string owner, string repos
             {
                 _logger.Warning("A release for milestone {Milestone} already exists, and will be updated", milestone);
 
-                if (!release.Draft)
+                if (!release.Draft && !_configuration.Create.AllowUpdatePublishedRelease)
                 {
                     throw new InvalidOperationException("Release is not in draft state, so not updating.");
                 }