get-diff-action | GitHub Actions to get git diff | Continous Integration library

I am trying to execute some option steps if the previous step is failing. I need to download the old artifacts in order to avoid that my Terraform build action is not detecting changes. Therefore I added a diff action to identify if the docker file to build the zip-layer has changed, if there is no change the old artifacts from a previous execution should be downloaded. In some cases the last execution does not contain the artifacts e.g. failure of the jobs. In that case I would like to get the latest version based on the existing docker image. Note: The code is part of a matrix execution but for simplicity I reduced the action to the problem area.