Fix CI: use dotnet msbuild -restore to properly disable analyzers

The separate restore + build steps caused StyleCop analyzers to be
restored unconditionally, then EnableAnalyzers=false had no effect
since packages were already resolved. Using dotnet msbuild -restore
(matching upstream build.sh) passes the property during both restore
and build phases.

.github/workflows/build.yml

@@ -46,14 +46,10 @@ jobs:
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}
 
-      - name: Restore
-        run: dotnet restore src/Prowlarr.sln
-
       - name: Build
         run: >-
-          dotnet build src/Prowlarr.sln
-          --no-restore
-          -c Release
+          dotnet msbuild -restore src/Prowlarr.sln
+          -p:Configuration=Release
           -p:Platform=${{ matrix.platform }}
           -p:EnableAnalyzers=false
 
@@ -85,14 +81,10 @@ jobs:
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}
 
-      - name: Restore
-        run: dotnet restore src/Prowlarr.sln
-
       - name: Build
         run: >-
-          dotnet build src/Prowlarr.sln
-          --no-restore
-          -c Release
+          dotnet msbuild -restore src/Prowlarr.sln
+          -p:Configuration=Release
           -p:Platform=${{ matrix.platform }}
           -p:EnableAnalyzers=false