# syntax=docker/dockerfile:1
# Static teaching site: bash assembles dist/ from the split source, then a pinned
# nginx-unprivileged serves it. No Node build — build.sh is plain bash + coreutils.

# ---- build stage ----------------------------------------------------------
# Reusing the digest the site image already pins: it's a bookworm-slim base that is
# verified and cached in the zot pull-through mirror, so this layer costs nothing
# extra. Only bash/sed/find/install are used here — node itself is incidental.
FROM node:22-bookworm-slim@sha256:d9f850096136edbc402debdd8729579a288aac64574ada0ff4db26b6ae58b0b2 AS build
ARG BUILD_REV=dev
ENV BUILD_REV=$BUILD_REV
WORKDIR /app
COPY . .
RUN bash build.sh

# ---- runtime stage --------------------------------------------------------
# Same vetted digest as the site. Renovate keeps it current.
FROM ghcr.io/nginx/nginx-unprivileged:1.28.0-alpine@sha256:c97ff0bf7cbae369953c6da1232ec14ad9f971d66360c5698db0856a4cd657a0

COPY nginx/default.conf /etc/nginx/conf.d/default.conf
COPY nginx/security-headers.conf /etc/nginx/security-headers.conf
COPY --from=build /app/dist /usr/share/nginx/html

EXPOSE 8080