This action would usually follow a build/test action which leaves deployable code in `GITHUB_WORKSPACE`.
# Required SECRETs
This action needs a `DEPLOY_KEY` secret variable. This should be the private key part of an ssh key pair. The public key part should be added to the authorized_keys file on the server that receives the deployment.
# Required ARGs
This action can receive three `ARG`s:
1. The first is for any initial/required rsync flags, eg: `-avzr --delete`
2. The second is for any `--exclude` flags and directory pairs, eg: `--exclude .htaccess --exclude /uploads/`. Use "" if none required.
3. The third is for the deployment target, and should be in the format: `[USER]@[HOST]:[PATH]`
If you're using GitHub Actions, you'll probably already know that it's still in limited public beta, and GitHub advise against using Actions in production.
So, check your keys. Check your deployment paths. And use at your own risk.