Fixing GHCR “Unauthorized” + Docker “Cannot perform interactive login from non-TTY” in GitHub Actions + SSH Deployments

A developer resolved two common deployment errors—GHCR “Unauthorized” and Docker “Cannot perform interactive login from non-TTY”—by configuring GitHub Actions to use a personal access token (PAT) with the `write:packages` scope and passing credentials via environment variables rather than interactive prompts. The fix enables automated SSH deployments to pull private container images from GitHub Container Registry without manual login.