Fix the UMD build of the react embedded components

[cmdcolin]

the PR in #3162 did not quite work, as the version number was not updated. I should test this PR out maybe on a locally private npm publish to see if it works but this PR changes the logic a bit to use prepack instead of postversion, and commits the change

reference
https://github.com/semantic-release/semantic-release/blob/master/docs/support/FAQ.md#how-can-i-use-a-npm-build-script-that-requires-the-packagejsons-version-

[codecov]

Codecov Report

Merging #3191 (6ef189b) into main (fa36931) will not change coverage.
The diff coverage is n/a.

❗ Current head 6ef189b differs from pull request most recent head 694d166. Consider uploading reports for the commit 694d166 to get more accurate results

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[cmdcolin]

actually this only affected the storybook build. still need to properly git commit the version change in the postversion step, but it is accurately reported in e.g. our demos like https://jbrowse.org/demos/lgv/

[garrettjstevens]

It looks like bundle (which was introduced in #3162) in @jbrowse/react-linear-genome-view didn't get run, so the UMD files were not included in the last release (see unpkg for 2.1.3 vs. 2.1.2). Will this fix that issue as well?

[cmdcolin]

just saw that! checking into it now

[cmdcolin]

i think this should be fixed now. I can see on the release machine the umd bundles were never created but this branch should create them properly, and it changes postversion to prepack

[cmdcolin]

I could investigate why postversion doesn't work perhaps but i think we could go ahead and create a quick point release with this to restore UMD@latest