Update image reference for Trivy vulnerability scanner

.github/workflows/docker-build-push.yml

@@ -54,7 +54,7 @@ jobs:
             - name: Run Trivy vulnerability scanner
               uses: aquasecurity/trivy-action@0.27.0
               with:
-                  image-ref: ghcr.io/thoguet/vac-optimizer@sha256:${{ steps.build.outputs.digest }}
+                  image-ref: ghcr.io/${{ github.repository }}@${{ steps.build.outputs.digest }}
                   format: 'sarif'
                   output: 'trivy-results.sarif'