Upgrade to Go 1.26.6

[andrew]

Select Go 1.26.6 through the toolchain directive in go.mod while keeping the module compatibility floor at Go 1.25.6. CI, release, and Swagger workflows read the selected version from go.mod, and Docker uses the matching Go image.

[Copilot]

Pull request overview

Raises the repository’s minimum Go version to 1.26.5 and updates developer-facing documentation plus GitHub Actions workflows to use that version, aligning local builds, CI, and the module’s declared Go toolchain baseline.

Changes:

• Bump go.mod go directive to 1.26.5.
• Update README build requirements to Go 1.26.5+.
• Update CI and swagger-generation workflows to run with Go 1.26.5.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
README.md	Updates “Building from Source” requirements to Go 1.26.5+.
go.mod	Raises the module’s minimum Go version to 1.26.5.
.github/workflows/swagger.yml	Pins workflow Go version to 1.26.5 for swagger generation.
.github/workflows/ci.yml	Updates CI matrix and lint job to run on Go 1.26.5.

Suppressed comments (1)

.github/workflows/ci.yml:45

• This workflow hardcodes the Go version. Since the repo already uses go-version-file: go.mod in the release workflow, switching to go-version-file here reduces duplication and prevents CI from drifting from go.mod over time.

      - name: Set up Go
        uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
        with:
          go-version: '1.26.5'

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[kokes]

How about setting toolchain in go.mod and letting actions/setup-go (and other tooling) leverage that? A single place to define it would make updates straightforward (and version selection automatically enforced project-wide).

[andrew]

@kokes done