Adding deploy message

### The use case you're trying to solve

I would like to add the commit message as a deploy message

### Change to the action that would solve that use case

Maybe add a new parameter that can use **github.event.head_commit.message** and attach it to the cli when making the deploy

Start at the action's deploy input handling and the CLI invocation described in the issue. Trace how GitHub event values are exposed to the action, then verify how a commit message could be passed as the deploy message; done means a new parameter supports github.event.head_commit.message during deployment.

Written by the indexing model from the issue text.