ci(ecr): build the combined mock_chain_validation-mock_balances flavor per ref

[bdchatham]

The chaos harness suite consumes the combined mock_chain_validation-mock_balances seid flavor, which today is producible only by the nightly pipeline from main HEAD. A workflow_dispatch of ecr.yml for an arbitrary ref (the mechanism for validating a PR head against the harbor nightly harness) covers every other suite's flavor but not chaos.

Adds a fifth build step mirroring the nightly pipeline's combined-flavor step, using ecr.yml's shared build cache and tag scheme (mock_chain_validation-mock_balances-<ref>). Found while wiring full-harness validation of #3753 against its true head.

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[claude]

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[cursor]

PR Summary

Low Risk
CI-only workflow addition; no runtime, auth, or application code changes.

Overview
Adds a fifth ECR publish step in ecr.yml that builds and pushes seid with both mock_balances and mock_chain_validation Go tags—the image the chaos harness expects for fresh-chain replays with pre-funded accounts.

The new step sits alongside the existing single-tag mock variants and uses the same shared registry build cache and ref-based tag pattern (mock_chain_validation-mock_balances-<ref>). workflow_dispatch (or push) for an arbitrary ref can now produce that combined flavor, which previously only nightly-ecr built from main.

^{Reviewed by Cursor Bugbot for commit dd93779. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jul 14, 2026, 8:43 PM

[seidroid]

Adds a fifth ECR build step that produces the combined mock_chain_validation-mock_balances seid flavor for an arbitrary ref, mirroring the existing mock-flavor steps exactly. The change is correct, consistent, and safe to merge.

Findings: 0 blocking | 2 non-blocking | 0 posted inline

Blockers

• None at the file/PR level.

Non-blocking

• The Cursor second-opinion review file (cursor-review.md) was empty — that pass produced no output. Codex reported no material issues, and REVIEW_GUIDELINES.md was empty.
• Verified against the Dockerfile: GO_BUILD_TAGS is expanded into BUILD_TAGS="netgo ledger ${GO_BUILD_TAGS}", so the space-separated mock_balances mock_chain_validation value correctly resolves to two build tags. The new step's cache, platform, and tag-fallback settings match the surrounding steps.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.02%. Comparing base (49f4d34) to head (dd93779).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3756      +/-   ##
==========================================
- Coverage   59.93%   59.02%   -0.92%     
==========================================
  Files        2288     2201      -87     
  Lines      189868   180025    -9843     
==========================================
- Hits       113793   106255    -7538     
+ Misses      65942    64438    -1504     
+ Partials    10133     9332     -801     

Flag	Coverage Δ
sei-db	70.41% <ø> (ø)
sei-db-state-db	?

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