What does this PR do?

Close #8186

Related Issue

#8186

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 🔒 Security fix
• 📝 Documentation update
• ✅ Tests (adding or improving test coverage)
• ♻️ Refactor (no behavior change)
• 🎯 New skill (bundled or hub)

Changes Made

In Dockerfile:

RUN apt-get update && \
    apt-get install -y --no-install-recommends \
        build-essential nodejs npm openssh-client python3 python3-pip ripgrep ffmpeg gcc python3-dev libffi-dev procps && \  # Added openssh-client here  
    rm -rf /var/lib/apt/lists/*

How to Test

1. Build the image with the fix:

   docker build -t hermes-agent:test .

2. Verify openssh-client is installed:

   docker run --rm hermes-agent:test which ssh
   # Expected: /usr/bin/ssh
   
   docker run --rm hermes-agent:test ssh -V
   # Expected: OpenSSH_x.x ...

3. (Optional) Full SSH backend test:

   docker run --rm -e TERMINAL_SSH_HOST=host.docker.internal \
     -e TERMINAL_SSH_USER=$USER \
     -v ~/.ssh/id_ed25519:/root/.ssh/id_ed25519:ro \
     hermes-agent:test hermes chat -q "Run: whoami"

Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits (fix(scope):, feat(scope):, etc.)
• I searched for existing PRs to make sure this isn't a duplicate
• My PR contains only changes related to this fix/feature (no unrelated commits)
• I've run pytest tests/ -q and all tests pass
• I've added tests for my changes (required for bug fixes, strongly encouraged for features)
• I've tested on my platform:

Documentation & Housekeeping

• I've updated relevant documentation (README, docs/, docstrings) — or N/A
• I've updated cli-config.yaml.example if I added/changed config keys — or N/A
• I've updated CONTRIBUTING.md or AGENTS.md if I changed architecture or workflows — or N/A
• I've considered cross-platform impact (Windows, macOS) per the compatibility guide — or N/A
• I've updated tool descriptions/schemas if I changed tool behavior — or N/A

For New Skills

• This skill is broadly useful to most users (if bundled) — see Contributing Guide
• SKILL.md follows the standard format (frontmatter, trigger conditions, steps, pitfalls)
• No external dependencies that aren't already available (prefer stdlib, curl, existing Hermes tools)
• I've tested the skill end-to-end: hermes --toolsets skills -q "Use the X skill to do Y"

Screenshots / Logs