For serious usecases always use a pinned version which is of the form @vX.Y.Z since this will download compiled binary. Addition to being faster to run, it is also more secure than using a commit from a branch

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Use a pinned stable version of Digger

To pin a specific release of Digger, you can use @vX.Y.Z tag in your workflow file: 
- name: digger
  uses: diggerhq/digger@v0.1.10
  env:
    ...

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Use latest commit from a branch

You can also run latest commit from a specific branch Only use this at your own risk in non-production scenarios. This can break things!
Only use this at your own risk in non-production scenarios. This can break things!
- name: digger
  uses: diggerhq/digger@yolo-lets-do-it
  env:
    ...