message: Try to use a specific version of docker file
diff: @@ -44,7 +44,7 @@ jobs:
  python:
  docker:
  - - image: gudhi/ci_for_gudhi:latest
  + - image: gudhi/ci_for_gudhi@sha256:9c90c7965f2288470fd5b374200f5b1bc23a9bd9939ece9f1bf864a6135fccb5
  parallelism: 4
  steps:
  - checkout
  