Fix generate assertion document workflow

[karensantana]

Proposed changes

The workflow execution for Generate Assertion Document is failing due to an environment variable not found. This fix adds a step for getting the secrets from the Azure Vault.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.96%. Comparing base (721944d) to head (9d0cfea).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1722      +/-   ##
==========================================
- Coverage   85.00%   84.96%   -0.05%     
==========================================
  Files         105      105              
  Lines       13593    13593              
==========================================
- Hits        11555    11549       -6     
- Misses       1524     1529       +5     
- Partials      514      515       +1     

see 8 files with indirect coverage changes

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