chore: Upgrade to .NET 8

This commit:

- Adds a global.json file to declare the required SDK version
- Updates CI to install both .NET 6 and .NET 8
- Updates the test projects to test with both .NET 6 and .NET 8

Signed-off-by: Jon Skeet <[email protected]>

.github/workflows/build.yml

@@ -19,11 +19,14 @@ jobs:
       with:
         submodules: true
 
-    # Build with .NET 6.0 SDK
-    - name: Setup .NET 6.0
+    # Build with .NET 8.0 SDK
+    # Test with .NET 6.0 and 8.0
+    - name: Setup .NET 6.0 and 8.0
       uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 6.0.x
+        dotnet-version: |
+          8.0.x
+          6.0.x
 
     - name: Build
       run: |

.github/workflows/nuget.yml

@@ -17,11 +17,14 @@ jobs:
       with:
         submodules: true
 
-    # Build with .NET 6.0 SDK
-    - name: Setup .NET 6.0
+    # Build with .NET 8.0 SDK
+    # Test with .NET 6.0 and 8.0
+    - name: Setup .NET 6.0 and 8.0
       uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 6.0.x
+        dotnet-version: |
+          8.0.x
+          6.0.x
 
     - name: Build
       run: |

global.json

@@ -0,0 +1,7 @@
+{
+  "sdk": {
+    "version": "8.0.100",
+    "allowPrerelease": false,
+    "rollForward": "latestMinor"
+  }
+}

test/CloudNative.CloudEvents.IntegrationTests/CloudNative.CloudEvents.IntegrationTests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>

test/CloudNative.CloudEvents.UnitTests/CloudNative.CloudEvents.UnitTests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
     <Nullable>enable</Nullable>
   </PropertyGroup>