cd: Fix env var reference

[akash1810]

What does this change?

Following the changes in #2071, the release of the GitHub Pages site during CD has broken:

This change updates how GITHUB_REPOSITORY is referenced to fix the build. https://docs.github.com/en/actions/security-guides/automatic-token-authentication#example-2-calling-the-rest-api used for inspiration.

How to test

It's a bit difficult to test as this part of the workflow has a condition to only run on the main branch. The real test will happen upon merge.

I've run the workflow manually to ensure the syntax is valid.

How can we measure success?

CD works again.

Have we considered potential risks?

N/A

Checklist

• I have listed any breaking changes, along with a migration path ¹
• I have updated the documentation as required for the described changes ²

Footnotes

1. Consider whether this is something that will mean changes to projects that have already been migrated, or to the CDK CLI tool. If changes are required, consider adding a checklist here and/or linking to related PRs. ↩

2. If you are adding a new construct or pattern, has new documentation been added? If you are amending defaults or changing behaviour, are the existing docs still valid? ↩

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