Build with the .NET 5.0 SDK

Signed-off-by: Jon Skeet <jonskeet@google.com>

.github/workflows/build.yml

@@ -17,18 +17,23 @@ jobs:
     - name: Check out our repo
       uses: actions/checkout@v2
 
-    # We need just the .NET Core 2.1 runtime for testing    
+    # We need the .NET Core 2.1 and .NET Core 3.1 runtimes for testing
     - name: Setup .NET Core 2.1
       uses: actions/setup-dotnet@v1
       with:
         dotnet-version: 2.1.x
 
-    # Build with .NET Core 3.1 SDK
     - name: Setup .NET Core 3.1
       uses: actions/setup-dotnet@v1
       with:
         dotnet-version: 3.1.x
 
+    # Build with .NET Core 5.0 SDK
+    - name: Setup .NET Core 5.0
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 5.0.x
+
     - name: Build
       run: |
         dotnet build

.github/workflows/nuget.yml

@@ -15,18 +15,23 @@ jobs:
     - name: Check out our repo
       uses: actions/checkout@v2
 
-    # We need just the .NET Core 2.1 runtime for testing    
+    # We need the .NET Core 2.1 and .NET Core 3.1 runtimes for testing
     - name: Setup .NET Core 2.1
       uses: actions/setup-dotnet@v1
       with:
         dotnet-version: 2.1.x
 
-    # Build with .NET Core 3.1 SDK
     - name: Setup .NET Core 3.1
       uses: actions/setup-dotnet@v1
       with:
         dotnet-version: 3.1.x
 
+    # Build with .NET Core 5.0 SDK
+    - name: Setup .NET Core 5.0
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 5.0.x
+
     - name: Build
       run: |
         dotnet build -c Release