feat(cli): add --docker-path flag to read-configuration command

[skevetter]

Summary

Adds --docker-path flag to the read-configuration command, allowing users to specify a custom docker/podman executable path when reading configuration from a running container via --container-id. Previously the command hardcoded "docker" as the container runtime binary. This aligns read-configuration with the exec command which already supports --docker-path.

Per the devcontainer CLI reference spec, the read-configuration command supports --docker-path as an optional flag for specifying the Docker CLI path (or Docker-compatible CLI) to use.

Changes:

• Added DockerPath field to ReadConfigurationCmd struct
• Registered --docker-path flag in NewReadConfigurationCmd() following the same pattern as cmd/exec.go
• Updated resolveConfigFromContainer() to use the custom docker path when specified (defaults to "docker" if empty)
• Added E2E tests: nonexistent container error, container without metadata label, valid --docker-path usage, and invalid --docker-path error

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📥 Commits

Reviewing files that changed from the base of the PR and between 271f84e and a1c589c.

📒 Files selected for processing (2)

• cmd/readconfiguration.go
• e2e/tests/readconfiguration/readconfiguration.go

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