ci: fix added bugs in frontend deploy workflow

[matthewelwell]

Changes

Fixes a few minor bugs in the changes added by #4977

How did you test this code?

Ran the job with some of the steps commented out to verify that the secrets are passed through correctly.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Jan 8, 2025 1:43pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Jan 8, 2025 1:43pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Jan 8, 2025 1:43pm

[github-actions]

Uffizzi Preview deployment-59657 was deleted.

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4979	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4979	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4979	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4979	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4979	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4979	Finished ✅	Results ✅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.39%. Comparing base (7b58be6) to head (9c57396).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4979   +/-   ##
=======================================
  Coverage   97.39%   97.39%           
=======================================
  Files        1191     1191           
  Lines       41630    41630           
=======================================
  Hits        40546    40546           
  Misses       1084     1084           

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