ci: attest build provenance

Author: mu88

.github/workflows/Playwright.yml

@@ -43,7 +43,7 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           push: true
-          provenance: false
+          provenance: true
           platforms: linux/arm64,linux/amd64
           tags: ghcr.io/mu88/screenshotcreator-playwright:latest,ghcr.io/mu88/screenshotcreator-playwright:${{ steps.extract_version.outputs.major_version }}.0.${{ github.run_number }}
           file: src/ScreenshotCreator.Api/Dockerfile-Playwright