fix: add openssh-server to system packages

[Mairuis]

Summary

Pre-install openssh-server into the agentbox Docker image so it no longer needs to be downloaded and installed every time the container starts.

Problem

The current dify-agentbox image does not include openssh-server. As a result, all three docker-compose files in dify run apt-get update && apt-get install -y openssh-server in the container's command: block on every startup. This adds unnecessary delay and network traffic each time the container restarts.

Changes

• Add openssh-server to system_packages.essential in versions/versions.yaml

Follow-up

A corresponding PR will be submitted to langgenius/dify to remove the runtime apt-get install openssh-server block from the agentbox command: in:

• docker/docker-compose.yaml
• docker/docker-compose-template.yaml
• docker/docker-compose.middleware.yaml

[github-actions]

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