Fail fast on unsupported multi-container configs#356
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Configs with more than one enabled [[containers]] block are unsupported (e.g. AWS + Snowflake), but previously passed validation and let start proceed, only to fail later during startup on container-name conflicts or shared port collisions — sometimes after image pulls had begun, leaving a partial startup and a confusing error. Guard against this at the top of container.Start, before any health/auth checks or image pulls, so startup stops early with a clear message. The check lives on the start path rather than config.Get() on purpose: recovery/reporting commands (stop, status, logout) must still enumerate multiple running emulators. This replaces the previous soft warning that only covered duplicate emulator types. Generated with [Linear](https://linear.app/localstack/issue/DEVX-952/fail-fast-on-unsupported-multi-container-configs#agent-session-1dac3d90) Co-authored-by: linear-code[bot] <222613912+linear-code[bot]@users.noreply.github.com>
anisaoshafi
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semver: patch
docs: skip
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Configs with more than one enabled
[[containers]]block are unsupported (e.g. AWS + Snowflake), but previously passed validation and letstartproceed only to fail later during startup on container-name conflicts or shared port collisions, sometimes after image pulls had already begun (partial startup + confusing error).This PR makes it fail fast.