Update deploy workflow for SSH configuration and Composer support

[rbruhn]

### Summary

This pull request includes updates and fixes for the existing deploy workflow:

- Bumps the `webfactory/ssh-agent` action to version 0.10.0.
- Adds SSH host key configuration for production and development environments to ensure secure deployment.
- Modifies the Deployer workflow to utilize the Composer binary effectively.

### Additional Context

These changes aim to address recent issues in deployment workflows and improve deployment reliability.