build: added support for .net 9

Author: payetools

.github/workflows/continuous.yml

@@ -26,6 +26,15 @@ jobs:
       - uses: actions/checkout@v3
         with:
           fetch-depth: 0
+
+      - name: Setup dotnet
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: |
+            6.0.x
+            8.0.x
+            9.0.100-rc.2.24474.11
+
       - name: 'Cache: .nuke/temp, ~/.nuget/packages'
         uses: actions/cache@v3
         with:

build/Build.cs

@@ -18,6 +18,20 @@
 using static Nuke.Common.Tools.DotNet.DotNetTasks;
 using static Nuke.Common.Tools.Slack.SlackTasks;
 
+/*
+ NB Until Nuke supports .net 9.0, the following must be added to the build yml file, immediately
+ after the checkout step:
+
+      - name: Setup dotnet
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: |
+            6.0.x
+            8.0.x
+            9.0.100-rc.2.24474.11
+
+ */
+
 [GitHubActions(
     "continuous",
     GitHubActionsImage.UbuntuLatest,

build/_build.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net9.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace></RootNamespace>
     <NoWarn>CS0649;CS0169;CA1050;CA1822;CA2211;IDE1006</NoWarn>
     <NukeRootDirectory>..</NukeRootDirectory>