added GitHub Actions workflow to automatically restore and build all .csproj files

Author: selfmadecode

.github/workflows/build.yaml

@@ -0,0 +1,28 @@
+name: .NET 9 Build
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup .NET 9
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 9.0.x
+
+      - name: Restore all projects
+        run: |
+          find . -name "*.csproj" -print0 | xargs -0 -n1 dotnet restore
+
+      - name: Build all projects
+        run: |
+          find . -name "*.csproj" -print0 | xargs -0 -n1 dotnet build --no-restore --configuration Release