fix: update documentation workflow

[clauBv23]

Description

This PR updates the documentation-updated workflow to define the alchemy key in the workflow env

Review

To check the change works properly needed to run the workflow and it only runs when pushing to develop. To avoid pushing not-tested code to develop in the commit 11485f9 added the current branch to force the workflow to run.
The workflow running successfuly can be seen here

Task ID: OS-1166

Type of change

See the framework lifecylce in packages/contracts/docs/framework-lifecycle to decide what kind of change this pull request is.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I ran all tests with success and extended them if necessary.
• I have updated the CHANGELOG.md file in the root folder.
• I have updated the DEPLOYMENT_CHECKLIST file in the root folder.
• I have updated the UPDATE_CHECKLIST file in the root folder.
• I have updated the Subgraph and added a QA URL to the description of this PR.