Update docker.io/library/golang Docker tag to v1.26.4 (main)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/library/golang	stage	patch	1.26.3 → 1.26.4

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Review — approve

Summary

Automated Renovate patch-level bump of the Go build image in Dockerfile: docker.io/library/golang:1.26.3 → 1.26.4.

The change is a single-line modification to the multi-stage build's FROM directive. No application code, configuration, tests, or documentation are affected.

Analysis

Dimension	Assessment
Correctness	✅ Trivially correct — only the Docker image tag changes. The build stage, arguments, and all subsequent steps are unchanged.
Security	✅ Positive — patch releases typically include security and bug fixes. Staying current with Go patch versions is good practice.
Intent & coherence	✅ Standard automated dependency update, appropriately scoped to a single file. Consistent with the project's Renovate configuration.
Style/conventions	✅ Follows the existing docker.io/library/golang:<version> convention without digest pinning (matching the project's current approach).
Documentation	✅ No documentation impact.
Cross-repo contracts	✅ No API, schema, or interface changes.

Go version note: The go.mod directive remains at go 1.26.3. This is fine — the Go toolchain respects the go.mod language version, and building with a newer patch-level image is standard practice. Renovate manages go.mod and Dockerfile updates independently.

Findings

No findings at or above the reporting threshold.

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Protected paths detected — this PR modifies files under one or more
protected paths. The review agent cannot approve PRs that touch these paths.
A human reviewer must approve this PR.

Protected files in this PR:

• Dockerfile

Previous run

Review

Outcome: Approve

Summary

Automated Renovate patch-version bump of the Go build image from golang:1.26.3 to golang:1.26.4 in the Dockerfile's build stage. This is a single-line change with no impact on application logic, APIs, or runtime behavior.

Analysis

Dimension	Finding
Correctness	✅ Patch version bump is backward-compatible with the go 1.26.3 directive in go.mod. No behavioral changes.
Security	✅ Patch releases typically include bug fixes and security patches — updating is beneficial.
Intent & scope	✅ Properly scoped automated dependency update; single file, single line.
Style	✅ No style changes.
Documentation	✅ No documentation impact.
Cross-repo contracts	✅ No API or schema changes.

No findings.

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Protected paths detected — this PR modifies files under one or more
protected paths. The review agent cannot approve PRs that touch these paths.
A human reviewer must approve this PR.

Protected files in this PR:

• Dockerfile

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Labels: PR updates Go toolchain version in Docker build stage

Previous run (2)

Review

Findings

High

• [protected-path] Dockerfile:19 — Dockerfile is a protected infrastructure file requiring human approval. This PR modifies it but has no linked issue providing explicit authorization for the change. While the PR is authored by renovate[bot] and renovate.json is configured for this repository (indicating this is an expected automated dependency update of golang from 1.26.3 to 1.26.4), protected-path changes always require human review and approval regardless of automation source.
  Remediation: A human maintainer must review and approve this Dockerfile change.

Previous run (3)

Review

Findings

High

• [protected-path] Dockerfile:19 — This PR modifies Dockerfile, which is a protected governance/infrastructure file requiring human approval. The PR has no linked issue providing authorization for this change. While the change is a mechanical Renovate patch version bump (golang 1.26.3 → 1.26.4), protected-path changes require explicit justification via a linked issue regardless of scope.
  Remediation: Ensure a human reviewer with appropriate permissions approves this protected-path change. For future automated dependency updates to protected files, consider linking a standing issue or policy that authorizes routine patch bumps.

Previous run (4)

Review

Findings

High

• [protected-path] Dockerfile:19 — This PR modifies Dockerfile, which is a protected path requiring human approval. The PR has no linked issue providing authorization for this change. While the Renovate bot description explains the version bump (golang 1.26.3 → 1.26.4) and the change itself is a routine patch update with no correctness or security concerns, protected-path changes without a linked issue require explicit human approval for traceability.
  Remediation: A maintainer should explicitly approve this protected-path change, or link an authorizing issue to the PR.

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Labels: PR modifies the Dockerfile for a Docker base image version bump.

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Superseded by updated review

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