maybe working pipeline?

.forgejo/workflows/build.yaml

@@ -8,15 +8,13 @@ on:
 jobs:
   build:
     runs-on: docker
+    container:
+      image: mcr.microsoft.com/dotnet/sdk:8.0
     steps:
       - uses: actions/checkout@v4
-      - name: Setup dotnet
-        uses: actions/setup-dotnet@v3
-        with:
-          dotnet-version: '8.0.x'
-      - name: Install dependencies
+      - name: dotnet restore
         run: dotnet restore
-      - name: Build
+      - name: dotnet build
         run: dotnet build
-      - name: Test with the dotnet CLI
+      - name: dotnet test
         run: dotnet test