gcl-sample

git clone https://github.com/scmlab/gcl-sample.git
code gcl-sample

and choose "Reopen in Container".

OR

D=/tmp/tmp-gcl-sample; rm -fR $D; mkdir -p $D; cd $D; \
git clone https://github.com/scmlab/gcl-sample.git; \
code --user-data-dir $D/u --extensions-dir $D/e gcl-sample