fix: allow staging hub image tag

[BhagyaAmarasinghe]

What changed:

• Adds a manual ECR workflow option to tag a Hub build as staging.
• Allows staging to be rebuilt from current main with both /app/hub-api and /app/hub-worker in the image.

Tested:

• git diff --check
• Dispatched Build & Push to AWS ECR with version_override=0.2.1-staging.20260507 and deploy_staging=true.
• Restarted hub-stage-worker and verified the rollout succeeded.

Notes:

• The previous live hub:staging image did not include /app/hub-worker, which caused hub-stage-worker to crash-loop.

[coderabbitai]

Walkthrough

The pull request modifies the build-and-push-ecr workflow to add a new deploy_staging boolean input for workflow_dispatch. This input defaults to false and controls whether an additional :staging tag is appended to the ECR tag list during Docker image building. The input is wired to the "Build ECR tag list" step environment and used in conditional logic that generates the newline-separated TAGS variable, adding the staging tag alongside the existing version and production tag handling.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	PR description lacks structured sections required by template; missing testing instructions, checklist, and formal section headings.	Reformat description to follow template: add 'What does this PR do?', 'How should this be tested?', and required/appreciated checklist items.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'fix: allow staging hub image tag' clearly summarizes the main change, which is enabling the ability to tag hub images with a staging tag for ECR deployment.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[xernobyl]

LGTM