Pin Hugo to 0.164.0

[andrew]

Pins Hugo 0.164.0 in GitHub Actions and uses the matching official Hugo image for Docker builds. This keeps CI and container builds on the same release.

Also replaces deprecated languageCode with locale and excludes local _vendor contents from Docker builds so Hextra resolves from go.mod.

[Copilot]

Pull request overview

Pins the Hugo version used in CI and aligns Docker-based builds with that Hugo release, while updating Hugo configuration for newer Hugo deprecations and adjusting Docker build context to influence Hugo Module resolution.

Changes:

• Pin Hugo to 0.164.0 in GitHub Actions workflows.
• Switch Docker build stage to the official Hugo image and adjust build paths/ownership handling.
• Replace deprecated languageCode with locale and exclude _vendor/ from Docker build context.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
hugo.yaml	Replaces deprecated languageCode with locale.
Dockerfile	Switches builder base image to Hugo v0.164.0, updates workdir/copy behavior, and adjusts output copy path.
.github/workflows/pages.yml	Pins Hugo version to 0.164.0 for Pages deploy workflow.
.github/workflows/build.yml	Pins Hugo version to 0.164.0 for PR/push build workflow.
.dockerignore	Excludes _vendor/ from Docker build context.

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