Shell out to docker instead of using bollard

[fnando]

What

Replaces the bollard Docker API client with direct docker CLI invocations in the stellar container start|stop|logs commands. The --docker-host flag (and the DOCKER_HOST env var) is now applied by setting DOCKER_HOST on the spawned docker process; host resolution is otherwise left to docker itself. The unused bollard dependency in stellar-ledger is also removed.

Why

The bollard connection code copied unreleased upstream source, pinned a hardcoded API version, and reimplemented host/socket resolution plus a Docker Desktop fallback that the docker CLI already handles natively. It also rejected any host scheme it didn't recognize — e.g. ssh://, which docker supports — with URI scheme is not supported. Shelling out to docker removes that hand-rolled logic and lets docker resolve the connection, including remote ssh:// hosts.

$ stellar container start --docker-host ssh://fnando@fnando-server.local
ℹ️ Starting local network
ℹ️ testing: Pulling from stellar/quickstart
ℹ️ Digest: sha256:3b98cc624a235215bbb2dedd18bd3ec3a498053b6b6533533b6a0d94354a7885
ℹ️ Status: Image is up to date for stellar/quickstart:testing
✅ Started container
🔎 Watch logs with `stellar container logs local --docker-host ssh://fnando@fnando-server.local`
ℹ️ Stop the container with `stellar container stop local --docker-host ssh://fnando@fnando-server.local`

$ stellar container start --docker-host ssh://fnando@fnando-server.local
ℹ️ Starting local network
ℹ️ testing: Pulling from stellar/quickstart
ℹ️ Digest: sha256:3b98cc624a235215bbb2dedd18bd3ec3a498053b6b6533533b6a0d94354a7885
ℹ️ Status: Image is up to date for stellar/quickstart:testing
❌ error: a container named "stellar-local" already running

$ stellar container logs --docker-host ssh://fnando@fnando-server.local
Starting Stellar Quickstart
versions:
  quickstart: 16a57418b555ab859e133550c449ff15c2f5c06e
  xdr:
    stellar-xdr 27.0.0 (5262803470be965e42f80023d12fba12808c774a)
    xdr: 68fa1ac55692f68ad2a2ca549d0a283273554439
    features: <none>
  ...

$ stellar container stop --docker-host ssh://fnando@fnando-server.local
ℹ️ Stopping local container
✅ Container stopped

$ stellar container stop --docker-host ssh://fnando@fnando-server.local
ℹ️ Stopping local container
❌ error: container local not found

Known limitations

The docker binary must now be installed and on the user's PATH; if it isn't, commands fail with a "is docker installed and on your PATH?" hint.

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[Copilot]

Pull request overview

This pull request replaces the bollard-based Docker integration in stellar container start|stop|logs with direct docker CLI invocations, delegating host/socket resolution (including ssh://) to Docker itself and removing the unused bollard dependency from the workspace.

Changes:

• Reimplemented container start, stop, and logs to shell out to docker, applying --docker-host/DOCKER_HOST by setting DOCKER_HOST on the spawned process.
• Simplified container error handling by parsing docker stderr for “already in use” / “No such container” cases.
• Removed the bollard dependency from the workspace and affected crates.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
cmd/soroban-cli/src/commands/container/start.rs	Switches container startup/pull logic to docker pull + docker run, adds stderr-based error mapping.
cmd/soroban-cli/src/commands/container/stop.rs	Switches container stop to docker stop and maps “No such container” via stderr.
cmd/soroban-cli/src/commands/container/logs.rs	Switches log tailing to docker logs -f --tail all with inherited stdio.
cmd/soroban-cli/src/commands/container/shared.rs	Replaces bollard connection logic with a docker_command() builder that sets DOCKER_HOST when provided.
cmd/soroban-cli/Cargo.toml	Removes bollard dependency from the soroban-cli crate.
cmd/crates/stellar-ledger/Cargo.toml	Removes bollard dependency from stellar-ledger crate.
Cargo.toml	Removes bollard from workspace dependencies.
Cargo.lock	Removes bollard from the resolved dependency graph.