message: use existing tarpaulin image
diff: @@ -408,7 +408,7 @@ jobs:
  name: coverage
  runs-on: ubuntu-latest
  container:
  - image: <your [CI] docker image with installed tarpaulin>
  + image: xd009642/tarpaulin:develop-nightly
  options: --security-opt seccomp=unconfined
  steps:
  - name: Checkout repository
  