Upgrade Go to 1.26.3

[thomasmaas]

Upgrade Go from 1.25.9 to 1.26.3.

Changes:

• go.mod: go 1.25.9 → go 1.26.3
• Dockerfile: mirror.gcr.io/library/golang:1.25 → mirror.gcr.io/library/golang:1.26

Summary by CodeRabbit

• Chores
  • Updated Go toolchain version from 1.25 to 1.26 in project documentation, Docker build configuration, and Go module settings.

[coderabbitai]

📝 Walkthrough

Walkthrough

Bumps the Go version from 1.25 to 1.26 in three places: the go directive in go.mod is updated from 1.25.9 to 1.26.3, the Docker builder stage base image is updated from golang:1.25 to golang:1.26, and the CLAUDE.md documentation is updated to reference Go 1.26+.

Changes

Go 1.26 Version Bump

Layer / File(s)	Summary
Go 1.26 version update across module, Docker, and docs go.mod, Dockerfile, CLAUDE.md	go.mod directive bumped from 1.25.9 to 1.26.3, Dockerfile builder stage base image updated from golang:1.25 to golang:1.26, and CLAUDE.md updated to reflect Go 1.26+ as the minimum requirement.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐇 A version bump, small but true,
From twenty-five to twenty-six it grew!
The module, the Docker, the docs all say,
Go 1.26 is here to stay.
Hippity-hop, the toolchain's new! 🎉

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Upgrade Go to 1.26.3' directly and accurately summarises the primary change across all modified files (go.mod, Dockerfile, and CLAUDE.md).
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.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch upgrade-go-1.26.3

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.86%. Comparing base (08bb9bc) to head (77e55d3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #262      +/-   ##
==========================================
- Coverage   77.89%   75.86%   -2.04%     
==========================================
  Files          18       18              
  Lines        1131     1131              
==========================================
- Hits          881      858      -23     
- Misses        202      217      +15     
- Partials       48       56       +8     

Flag	Coverage Δ
integration	71.52% <ø> (-2.22%)	⬇️
unit	47.06% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
api/v1alpha1 (u)	91.48% <ø> (ø)
pkg/helpers (u)	80.95% <ø> (ø)
pkg/log (u)	94.73% <ø> (ø)
pkg/reconcilers (u)	63.12% <ø> (-1.42%)	⬇️
pkg/limitador (u)	98.27% <ø> (ø)
controllers (i)	70.02% <ø> (-6.06%)	⬇️
pkg/upgrades	∅ <ø> (∅)
see 3 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[thomasmaas]

Needs a rebase once #263 has been merged.

[coderabbitai]

🧹 Nitpick comments (1)

Dockerfile (1)

2-2: 🧹 Nitpick | 🔵 Trivial | 💤 Low value

Consider pinning the Dockerfile builder image to match go.mod patch version for consistency.

The Dockerfile uses golang:1.26 (latest 1.26.x patch) whilst go.mod specifies 1.26.3 (exact patch). This minor asymmetry is generally safe—both will satisfy Go 1.26+ compatibility—but pinning the Dockerfile to golang:1.26.3 would ensure build reproducibility matches the module directive exactly.

This is a style preference and not a functional issue.

Optional: Pin Dockerfile builder to exact patch version

-FROM --platform=$BUILDPLATFORM mirror.gcr.io/library/golang:1.26 AS builder
+FROM --platform=$BUILDPLATFORM mirror.gcr.io/library/golang:1.26.3 AS builder

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@Dockerfile` at line 2, The Dockerfile builder image should be pinned to the
exact patch version for consistency with go.mod. In the FROM instruction that
currently specifies golang:1.26, change the image tag to golang:1.26.3 to match
the exact Go version declared in go.mod and ensure reproducible builds across
environments.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Nitpick comments:
In `@Dockerfile`:
- Line 2: The Dockerfile builder image should be pinned to the exact patch
version for consistency with go.mod. In the FROM instruction that currently
specifies golang:1.26, change the image tag to golang:1.26.3 to match the exact
Go version declared in go.mod and ensure reproducible builds across
environments.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: f1a7b75c-5ec0-45fa-bd8b-b5f071ed0a6d

📥 Commits

Reviewing files that changed from the base of the PR and between 08bb9bc and 77e55d3.

📒 Files selected for processing (3)

• CLAUDE.md
• Dockerfile
• go.mod

[thomasmaas]

Follow-up: #264 — remove hardcoded Go version from docs to avoid drift on future bumps.