ci: fix workflow syntax

[matthewelwell]

Changes

Fixes syntax error in ECS deployment as seen here.

How did you test this code?

Ran the workflow (with the actual deployment steps removed) - see here. Note that we only care that the job actually ran as that confirms the syntax error is resolved.

[vercel]

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3 Skipped Deployments

Project	Deployment	Review	Updated (UTC)
docs	Ignored		Jan 22, 2026 0:18am
flagsmith-frontend-preview	Ignored		Jan 22, 2026 0:18am
flagsmith-frontend-staging	Ignored		Jan 22, 2026 0:18am

[khvn26]

LGTM

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-6576	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-6576	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-6576	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-6576	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-6576	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6576	Finished ✅	Results ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.16%. Comparing base (0d956a5) to head (c5617fa).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6576   +/-   ##
=======================================
  Coverage   98.16%   98.16%           
=======================================
  Files        1295     1295           
  Lines       46793    46793           
=======================================
  Hits        45934    45934           
  Misses        859      859           

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