[docs] add working dir to R package docker run examples

[jameslamb]

There are a few examples in the R-package documentation which rely on the use of Docker containers. These involve mounting in the current working directory, and then running cd to change directories to that location.

This PR proposes a minor change to remove that manual use of cd, just to make those examples slightly easier to use.

# before: run the container and then cd
docker run \
    -v $(pwd):/opt/LightGBM \
    -it ubuntu:latest \
    cd /opt/LightGBM && do-something

# after: run the container with working directory set to the location LightGBM is mounted in at
docker run \
    -v $(pwd):/opt/LightGBM \
    -w /opt/LightGBM \
    -it ubuntu:latest \
    do-something

[StrikerRUS]

Thanks!

[StrikerRUS]

Is it working without /bin/bash?

[jameslamb]

yep! The file is executable and has the shebang #!/bin/bash at the top.

LightGBM/R-package/recreate-configure.sh

Line 1 in dac7749

#!/bin/bash

I tested this before pushing the PR, so I'm confident in it.

[github-actions]

This pull request has been automatically locked since there has not been any recent activity since it was closed. To start a new related discussion, open a new issue at https://github.com/microsoft/LightGBM/issues including a reference to this.