build: add NET 7 to docs deploy workflow

Author: egil

.github/workflows/docs-deploy.yml

@@ -60,20 +60,15 @@ jobs:
         with:
           files: '["docs/site/*.md", "docs/**/*.md", "docs/**/*.tmpl.partial", "*.csproj", "**/*.csproj"]'
 
-      - name: ⚙️ Setup dotnet 3.1.x
-        uses: actions/setup-dotnet@v1
+      - name: ⚙️ Setup dotnet versions
+        uses: actions/setup-dotnet@v2
         with:
-          dotnet-version: '3.1.x'
-
-      - name: ⚙️ Setup dotnet 5.0.x
-        uses: actions/setup-dotnet@v1
-        with:
-          dotnet-version: '5.0.x'
-
-      - name: ⚙️ Setup dotnet 6.0.x
-        uses: actions/setup-dotnet@v1
-        with:
-          dotnet-version: 6.0.x
+          dotnet-version: |
+            3.1.x
+            5.0.x
+            6.0.x
+            7.0.x
+          include-prerelease: true
 
       - name: 🛠️ Building bUnit
         run: dotnet build /p:PublicRelease=true