chore(BA-2328): Add Dockerfile and entrypoint for Backend.AI Manager

[Yaminyam]

Introduces backend.ai-manager.Dockerfile to build and run the Backend.AI Manager service, including wheel installation, directory setup, and port exposure. Adds entrypoint.sh to handle keypair generation, directory creation, and service startup.

resolve #5823 (BA-2328)

docker run -d \
  --name backend-ai-manager \
  --add-host host.docker.internal:host-gateway \
  -p 8091:8091 \
  -v $(pwd)/fixtures:/app/fixtures:ro \
  -v $(pwd)/manager.toml:/etc/backend.ai/manager.toml:ro \
  -v $(pwd)/logs:/var/log/backend.ai \
  -v /tmp/backend.ai/ipc:/tmp/backend.ai/ipc \
  -v /var/run/docker.sock:/var/run/docker.sock \
  -e PYTHONUNBUFFERED=1 \
  --restart unless-stopped \
  backend.ai/manager:25.14.3

Checklist: (if applicable)

• Milestone metadata specifying the target backport version
• Mention to the original issue

[Copilot]

Pull Request Overview

Introduces Docker containerization support for the Backend.AI Manager service by adding a Dockerfile and entrypoint script to enable deployment as a containerized service.

• Adds multi-stage Docker build configuration for the Backend.AI Manager
• Implements entrypoint script for RPC keypair generation and directory setup
• Exposes port 8091 and sets up necessary volume mount points

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
backend.ai-manager.Dockerfile	Multi-stage Docker build with wheel installation and service configuration
entrypoint.sh	Bash script for container initialization, keypair generation, and service startup

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[Copilot]

Installing vim in a production container image adds unnecessary bloat. Consider removing this package unless it's specifically required for debugging purposes in production environments.

Suggested change

	RUN apt-get update && apt-get install -y vim && rm -rf /var/lib/apt/lists/*
	# Removed vim installation to reduce image bloat

[Copilot]

The comment on line 9 is misleading as it states 'RPC keypair not found' before the actual check. This comment should either be removed or moved inside the if block where the keypair is actually determined to be missing.

Suggested change

# RPC keypair not found. Generating...

[HyeockJinKim]

What is the purpose of this script?

[Yaminyam]

If the RPC key doesn't exist, you'll need to create it. The execution part has become complicated, so I separated it into an sh file.

[HyeockJinKim]

It seems like we need to do the wheel build inside the dockerfile.