fix(gatsby-plugin-nginx): remove trailing slash from incoming requests

[cezar-guimaraes]

What's the purpose of this pull request?

Fix an issue with headers not being properly set when a requested page has an exact match, but the request URL contains a trailing slash.
Removing the trailing slash, however, introduced a problem where locations like /graphql/(.*) wouldn't work without the trailing slash. So we convert the regex generated to allow the trailing slash to be omitted.

How it works?

How to test it?

base.store Deploy Preview

References

[netlify]

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🔨 Explore the source changes: d900804

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😎 Browse the preview: https://deploy-preview-1145--faststoreui.netlify.app

[netlify]

✔️ Deploy Preview for faststore-docs ready!

🔨 Explore the source changes: d900804

🔍 Inspect the deploy log: https://app.netlify.com/sites/faststore-docs/deploys/62053fcc771e0b00076f04c8

😎 Browse the preview: https://deploy-preview-1145--faststore-docs.netlify.app

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

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Latest deployment of this branch, based on commit d900804:

Sandbox	Source
Store UI Typescript	Configuration

[cezar-guimaraes]

preview using this version https://sfj-446d5ed--base.preview.vtex.app/
and passing checks https://github.com/vtex-sites/base.store/runs/5145467188