Is there a way to setup this without having a key specified?

[misilot]

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So what I would like to do is create a reusable workflow that will load the ssh-agent if the private key has been passed, but be able to have the ssh option always defined in the GHA for the docker/build-push-action action.

          ssh: |
            default=${{ env.SSH_AUTH_SOCK }}

Or is there a better way to create a reusable workflow that can do handle when you pass in a private key or when you don't.

Thanks!