CI: add Harden-Runner

Author: agarciadom

.github/workflows/build-and-test.yml

@@ -20,6 +20,9 @@ jobs:
             jdk: 21
     runs-on: ${{ matrix.os }}
     steps:
+    - uses: step-security/harden-runner@fa2e9d605c4eeb9fcad4c99c224cee0c6c7f3594
+      with:
+        egress-policy: audit    
     - uses: actions/checkout@v4
     - name: Install Webkit + GTK bindings
       run: sudo apt update -yq && sudo apt-get install -yq libwebkit2gtk-4.0-dev