Ensure npm credentials are set by publish_snapshot.sh

[jeremywiebe]

Summary:

We've seen Github action failures in the "Publish npm snapshot" job. This is because the npm auth info has not been provided (this is done automatically by the changesets Github Action, but we aren't using it here because we're publishing a snapshot.

This PR mimics what the changesets Github Action does by creating a .npmrc file with the credentials in it.

Issue: "none"

Test plan:

Create a new PR after landing this one.
Ensure that the "Publish npm snapshot" job succeeds.

[changeset-bot]

🦋 Changeset detected

Latest commit: 6f7d9ba

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 0 packages

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

npm Snapshot: NOT Published

🤕 Oh noes!! We couldn't find any changesets in this PR (a8fbdbf). As a result, we did not
publish an npm snapshot for you.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@1fe3786). Click here to learn what that means.
The diff coverage is n/a.

❗ Current head a2e9509 differs from pull request most recent head 6f7d9ba. Consider uploading reports for the commit 6f7d9ba to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #422   +/-   ##
=======================================
  Coverage        ?   65.98%           
=======================================
  Files           ?      487           
  Lines           ?   107108           
  Branches        ?     7376           
=======================================
  Hits            ?    70674           
  Misses          ?    36434           
  Partials        ?        0           

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[github-actions]

Size Change: 0 B

Total Size: 635 kB

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.4 kB
packages/kmath/dist/es/index.js	4.18 kB
packages/math-input/dist/es/index.js	60.2 kB
packages/perseus-editor/dist/es/index.js	112 kB
packages/perseus-error/dist/es/index.js	825 B
packages/perseus-linter/dist/es/index.js	18.6 kB
packages/perseus/dist/es/index.js	385 kB
packages/pure-markdown/dist/es/index.js	3.74 kB
packages/simple-markdown/dist/es/index.js	12.9 kB

_{compressed-size-action}

[jeremywiebe]

Lots of lines moved here. I've gathered bits of functionality into functions so it's a bit less of a "massive wall of procedural functionality". Now if you skip to line 107 you can follow the functionality more easily (I hope!). The new lines are in create_npmrc (lines 88-99)!

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to .changeset/yellow-garlics-return.md, utils/publish-snapshot.sh

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[handeyeco]

Looks like Bash to me 👍

[handeyeco]

Does this exit here prevent the following lines from running? Like yarn build and yarn extract-strings?

[jeremywiebe]

Oh yikes! Thanks for catching this. I'd added it to test something locally. Removed!!!