Added a publish.fsx script

Author: JordanMarr

src/Elmish.Avalonia.sln

@@ -12,6 +12,7 @@ EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Build", "Build", "{7E33C4FF-FDB6-45C5-8748-743F48523213}"
 	ProjectSection(SolutionItems) = preProject
 		build.fsx = build.fsx
+		publish.fsx = publish.fsx
 	EndProjectSection
 EndProject
 Global

src/publish.fsx

@@ -0,0 +1,37 @@
+#r "nuget: Fun.Build, 1.0.2"
+#r "nuget: Fake.Core.Environment, 5.22.0"
+
+open System.IO
+open System.Xml.Linq
+open Fun.Build
+open Fake.Core
+
+let src = __SOURCE_DIRECTORY__
+
+let version = 
+    let project = (FileInfo $"{src}/Elmish.Avalonia/Elmish.Avalonia.fsproj")
+    let doc = XDocument.Load(project.FullName)
+    doc.Descendants("Version") |> Seq.tryHead
+    |> Option.map (fun versionElement -> versionElement.Value)
+    |> Option.defaultWith (fun () -> failwith $"Could not find a <Version> element in '{project.Name}'.")
+
+let nugetKey =
+    match Environment.environVarOrNone "ELMISH_AVALONIA_NUGET_KEY" with
+    | Some nugetKey -> nugetKey
+    | None -> failwith "The NuGet API key must be set in an 'ELMISH_AVALONIA_NUGET_KEY' environmental variable"
+
+pipeline "Publish" {
+
+    stage "Build Elmish.Avalonia" {
+        run $"dotnet restore {src}/Elmish.Avalonia.sln"
+        run $"dotnet build {src}/Elmish.Avalonia.sln --configuration Release"
+    }
+    
+    stage "Publish Elmish.Avalonia" {
+        run $"dotnet nuget push \"{src}/Elmish.Avalonia/bin/Release/Elmish.Avalonia.{version}.nupkg\" -s nuget.org -k {nugetKey} --skip-duplicate"
+    }
+
+    runIfOnlySpecified false
+}
+
+tryPrintPipelineCommandHelp ()