ci: simplify tests on windows and unix

.github/workflows/build.yml

@@ -4,20 +4,19 @@ on:
   push:
 
 jobs:
-  test-nix:
-    name: Test on *NIX
+  build:
+    name: Build
     timeout-minutes: 30
     strategy:
       matrix:
         os:
           - "ubuntu-24.04"
+          - "windows-2022"
         dotnet-version:
           - "net8.0"
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
-      with:
-        submodules: recursive
 
     - name: Set up .NET
       uses: actions/setup-dotnet@v4
@@ -40,32 +39,4 @@ jobs:
       run: |
         dotnet build -f ${{ matrix.dotnet-version }} --no-restore
 
-  test-windows:
-    name: Test on Windows
-    timeout-minutes: 30
-    strategy:
-      matrix:
-        dotnet-version:
-          - "net8.0"
-    runs-on: "windows-2022"
-    steps:
-    - uses: actions/checkout@v4
-      with:
-        submodules: recursive
-
-    - name: Set up .NET
-      uses: actions/setup-dotnet@v4
-      with:
-        dotnet-version: |
-          8.0.x
-
-    - uses: actions/cache@v4
-      with:
-        path: ~/.nuget/packages
-        key: ${{ runner.os }}-nuget-${{ hashFiles('**/*.csproj') }}
-        restore-keys: |
-          ${{ runner.os }}-nuget-
-
-    - name: Install dependencies
-      run: |
-        dotnet restore
+