[ADD] Workflow: build on main push

.gitea/workflows/BuildLibrary.yml

@@ -0,0 +1,30 @@
+name: Build C# Library
+
+run-name: Build Library project
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup .NET SDK
+        uses: actions/setup-dotnet@v3
+        with:
+          dotnet-version: '6.0.x'
+
+      - name: Restore dependencies
+        run: dotnet restore
+
+      - name: Build library
+        run: dotnet build --configuration Release
+
+      - name: Run unit tests
+        run: dotnet test --configuration Release --no-build