ci: add check for failed deployments

[matthewelwell]

Changes

Closes to #6548

Verifies that the deployment successfully updated the task definition before exiting the workflow successfully.

How did you test this code?

Added current branch to deploy to staging temporarily (see here).

[vercel]

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Project	Deployment	Review	Updated (UTC)
flagsmith-frontend-preview	Ready	Preview, Comment	Jan 19, 2026 5:27pm
flagsmith-frontend-staging	Ready	Preview, Comment	Jan 19, 2026 5:27pm

1 Skipped Deployment

Project	Deployment	Review	Updated (UTC)
docs	Ignored		Jan 19, 2026 5:27pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-6549	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-6549	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-6549	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-6549	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-6549	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-6549	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6549	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-6549	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-6549	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-6549	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6549	Finished ✅	Results ✅

[cursor]

Cursor Bugbot has reviewed your changes and found 3 potential issues.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.09%. Comparing base (e2e77b0) to head (0b67c6b).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6549   +/-   ##
=======================================
  Coverage   98.09%   98.09%           
=======================================
  Files        1293     1293           
  Lines       46610    46610           
=======================================
  Hits        45722    45722           
  Misses        888      888           

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[emyller]

Thanks, this looks good! Couple blockers.

[matthewelwell]

The latest failure (here) was because of a concurrency issue. I've added concurrency checks to the deployment jobs too.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.}

[emyller]

Non blocking: is there any reason why this is defined at job level rather than workflow?

[emyller]

LGTM with one non-blocking comment.