fix: set workdir properly

[sjinks]

This pull request simplifies how the working directory is determined for Docker exec commands in the lando-tooling plugin. Instead of dynamically mapping the host's current working directory to the container, the code now always uses /app as the container's working directory unless a specific directory is provided.

Key changes:

Simplification of working directory logic:

• Removed the getContainerPath helper function, which previously mapped the host's current directory to the container's /app directory.
• Updated the buildCommand function to default the workdir option directly to /app instead of using the removed helper.

[Copilot]

Pull request overview

This pull request removes the automatic mapping of the host's current working directory to the container's working directory in Lando tooling commands. The change simplifies the working directory logic by always defaulting to /app instead of dynamically calculating the corresponding container path based on where the command is invoked from on the host.

Changes:

• Removed the getContainerPath helper function that mapped host paths to container paths
• Modified buildCommand to use a static /app default for workdir instead of dynamic path mapping

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