ci: use .NET 8 SDK

.github/workflows/dotnet.yml

@@ -16,9 +16,9 @@ jobs:
       uses: actions/checkout@v3
 
     - name: Setup .NET
-      uses: actions/setup-dotnet@v2
+      uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: 8.0.x
 
     - name: Add NuGet source
       run: dotnet nuget add source --username oliverbooth --password ${{ secrets.GITHUB_TOKEN }} --store-password-in-clear-text --name github "https://nuget.pkg.github.com/oliverbooth/index.json"

.github/workflows/nightly.yml

@@ -15,9 +15,9 @@ jobs:
       uses: actions/checkout@v3
 
     - name: Setup .NET
-      uses: actions/setup-dotnet@v2
+      uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: 8.0.x
 
     - name: Add GitHub NuGet source
       run: dotnet nuget add source --username oliverbooth --password ${{ secrets.GITHUB_TOKEN }} --store-password-in-clear-text --name github "https://nuget.pkg.github.com/oliverbooth/index.json"

.github/workflows/prerelease.yml

@@ -15,9 +15,9 @@ jobs:
       uses: actions/checkout@v3
 
     - name: Setup .NET
-      uses: actions/setup-dotnet@v2
+      uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: 8.0.x
 
     - name: Add GitHub NuGet source
       run: dotnet nuget add source --username oliverbooth --password ${{ secrets.GITHUB_TOKEN }} --store-password-in-clear-text --name github "https://nuget.pkg.github.com/oliverbooth/index.json"

.github/workflows/release.yml

@@ -15,9 +15,9 @@ jobs:
       uses: actions/checkout@v3
 
     - name: Setup .NET
-      uses: actions/setup-dotnet@v2
+      uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: 7.0.x
+        dotnet-version: 8.0.x
 
     - name: Add GitHub NuGet source
       run: dotnet nuget add source --username oliverbooth --password ${{ secrets.GITHUB_TOKEN }} --store-password-in-clear-text --name github "https://nuget.pkg.github.com/oliverbooth/index.json"

global.json

@@ -0,0 +1,7 @@
+{
+  "sdk": {
+    "version": "8.0.0",
+    "rollForward": "latestMajor",
+    "allowPrerelease": false
+  }
+}