Backport release/v6.6: Remove redundant libstdc++6 installation

[seidroid]

Backport of #3847 to release/v6.6.

[cursor]

PR Summary

Low Risk
Single-package removal from the runtime container build; no application or chain logic changes.

Overview
Backport of #3847 to release/v6.6.

The final Ubuntu runtime stage no longer installs libstdc++6 alongside ca-certificates; only ca-certificates is kept in the apt-get install line. This trims the image without changing how seid, seictl, or the copied .so libraries are laid out.

^{Reviewed by Cursor Bugbot for commit cac4c0b. 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	Aug 4, 2026, 1:54 PM

[claude]

LGTM — this is a straightforward backport of an already-merged, running change on main (cac4c0b3, PR #3847).

Extended reasoning...

Overview

The PR is a pure backport to release/v6.6 of commit cac4c0b (PR #3847), which is already merged and live on main. It removes libstdc++6 from the final apt-get install line in the Ubuntu runtime stage of the Dockerfile, leaving only ca-certificates. No other lines change.

Security risks

None. This only trims an unused runtime package from the container image; it does not touch application logic, permissions, credentials, or network-facing code.

Level of scrutiny

Minimal scrutiny is warranted. This is a mechanical, single-line Dockerfile change that mirrors a change already validated and running on main, so there is no new risk surface introduced by the backport itself. The main question — whether the Giga executor's libevmone.so still loads without libstdc++6 — was already exercised on main since PR #3847 merged, and a verifier in this run separately checked and ruled out dynamic-loading breakage.

Other factors

Single-file, single-line diff; no logic or test changes needed. No unresolved reviewer comments in the timeline (only an informational Cursor Bugbot summary).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.13%. Comparing base (c0f9682) to head (cac4c0b).

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v6.6    #3848      +/-   ##
================================================
- Coverage         59.01%   58.13%   -0.89%     
================================================
  Files              2225     2151      -74     
  Lines            183562   174994    -8568     
================================================
- Hits             108323   101726    -6597     
+ Misses            65493    64223    -1270     
+ Partials           9746     9045     -701     

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

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