Ensure build uses .NET6

Author: kzu

.github/workflows/build.yml

@@ -31,26 +31,34 @@ jobs:
           submodules: recursive
           fetch-depth: 0
 
+      - uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: '6.0.x'
+
       - name: ✓ ensure format
         run: |
-          dotnet tool update -g dotnet-format --version 5.0.*
           dotnet restore
-          dotnet format --check -v:diag
+          dotnet format --verify-no-changes -v:diag
 
   build:
     name: build-${{ matrix.os }}
     needs: dotnet-format
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macOS-latest]
+        os: [ubuntu-latest, windows-2022, macOS-latest]
     steps:
       - name: 🤘 checkout
         uses: actions/checkout@v2
         with: 
           submodules: recursive
           fetch-depth: 0
 
+      - uses: actions/setup-dotnet@v1
+        if: matrix.os != 'windows-2022'
+        with:
+          dotnet-version: '6.0.x'
+
       - name: 🙏 build
         run: dotnet build -m:1 -p:VersionLabel="$GITHUB_REF.$GITHUB_RUN_NUMBER"
 

.github/workflows/publish.yml

@@ -21,6 +21,10 @@ jobs:
           submodules: recursive
           fetch-depth: 0
 
+      - uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: '6.0.x'
+
       - name: 🙏 build
         run: dotnet build -m:1 -p:version=${GITHUB_REF#refs/*/v}