Fix OSTYPE check in ci_install.sh

[jtpio]

References

As noticed in #11770 (comment), the check against $OSTYPE in the ci_install.sh script doesn't seem to be hit at the moment.

Code changes

Update CI install script to see if this has any affect on the CI checks.

User-facing changes

None

Backwards-incompatible changes

None

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[jtpio]

The failing release_test check looks relevant: https://github.com/jupyterlab/jupyterlab/runs/4742334615?check_suite_focus=true

[jtpio]

So both check_release and release_test seem to be passing if we use jlpm instead of yarn.

Taking a second look at it, it seems we are using jlpm in the other @jupyterlab/buildutils scripts.

cc @blink1073 just to confirm such change would be appropriate.

[blink1073]

Yes that sounds correct.

[jtpio]

cc @jupyterlab/release for awareness

This should be good to go now.

[krassowski]

I think this makes sense, though I do not have the full context here.

[jtpio]

Thanks @krassowski and @blink1073 for the review!

though I do not have the full context here.

This is mostly to fix this condition on CI noticed in #11770 (comment).

[jtpio]

Merging as CI is now all passing.