🔧 Restore installation of .net6

Author: kzu

.github/workflows/build.yml

@@ -31,6 +31,12 @@ jobs:
           submodules: recursive
           fetch-depth: 0
 
+      - name: ⚙ dotnet 6.0.x
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: 6.0.x
+          include-prerelease: true
+
       - name: ✓ ensure format
         run: |
           dotnet tool update -g dotnet-format --version 5.0.*
@@ -51,6 +57,12 @@ jobs:
           submodules: recursive
           fetch-depth: 0
 
+      - name: ⚙ dotnet 6.0.x
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: 6.0.x
+          include-prerelease: true
+
       - name: 🙏 build
         run: dotnet build -m:1 -p:VersionLabel="$GITHUB_REF.$GITHUB_RUN_NUMBER"
 

.github/workflows/publish.yml

@@ -21,6 +21,12 @@ jobs:
           submodules: recursive
           fetch-depth: 0
 
+      - name: ⚙ dotnet 6.0.x
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: 6.0.x
+          include-prerelease: true
+
       - name: 🙏 build
         run: dotnet build -m:1 -p:version=${GITHUB_REF#refs/*/v}