ci: Add basic initial GitHub Actions workflow for PR validation (WIP)

Author: QuiqueLargachaGil

.github/workflows/pr-validation.yml

@@ -0,0 +1,26 @@
+name: PR Validation
+on:
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+    name: PR Validation
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up .NET Core
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 10.0
+
+      - name: dotnet format
+        run: dotnet format -v detailed --verify-no-changes
+
+      - name: Build with dotnet
+        run: dotnet build --configuration Release
+
+      - name: dotnet test
+        run: dotnet test --configuration Release --no-build