[chore]: build and release workflow update to match makefile changes

[banana-three-join]

Notes for Reviewers

• This PR should be merged after chore: Standardize Makefile npm scripts #141 has been merged
• Added Setup Go — required. make build-production → check-go hard-fails without it, and Hugo needs Go to resolve the academy-theme module.
• Removed peaceiris/actions-hugo — redundant. make setup installs hugo-extended into node_modules/.bin, and make build-production reaches Hugo via npm run (which puts .bin on PATH). Dropping it also removes a second place the Hugo version was pinned.
• make build → make build-production — the step claims a production build test; build is the dev build.
• academy-name now reads its declared workflow_dispatch input (${{ github.event.inputs.academy-name || 'Academy' }}) instead of being hardcoded, so the input is no longer ignored.
• Added Setup Node (20 + npm cache) and fetch-depth: 0 to the checkout.
• preview-deploy.yml unchanged — it bypasses make/npm run (direct hugo + npm ci), so it is unaffected by the script standardization.

Signed commits

• Yes, I signed my commits.

[github-actions]

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2026-07-08 16:39 UTC