I believe you’re slightly wrong with this. The github-actions ecosystem does updates on your GitHub Action workflows and has nothing to do with this action.
If youd like Dependabot to update your mix dependencies, you will have to specify the mix ecosystem. You can see an example of this here: mix-dependency-submission/.github/dependabot.yml at main · erlef/mix-dependency-submission · GitHub
However both of those already work without this project. What doesn’t work without this action, are Dependabot Security Updates for mix dependencies.
