fix(showcase/shell-dashboard): add missing Dockerfile modeled after shell-docs

Author: jpr5

showcase/shell-dashboard/Dockerfile

@@ -0,0 +1,84 @@
+# Build from repo root: docker build -f showcase/shell-dashboard/Dockerfile .
+# The build context MUST be the repository root; this Dockerfile copies from
+# showcase/scripts, showcase/shared, showcase/packages, showcase/shell (for
+# generated data JSON that shell-dashboard imports at build time), and
+# showcase/shell-dashboard.
+
+FROM node:20-slim AS builder
+ARG COMMIT_SHA=unknown
+ARG BRANCH=unknown
+# NEXT_PUBLIC_BASE_URL is inlined by Next.js at `next build`. Pass it via:
+#   docker build --build-arg NEXT_PUBLIC_BASE_URL=https://...
+# shell-dashboard's next.config.ts does not currently require it, but we
+# keep the plumbing consistent with shell-docs so callers (Railway, CI) set
+# a single canonical host for the build.
+ARG NEXT_PUBLIC_BASE_URL
+ENV NEXT_PUBLIC_BASE_URL=${NEXT_PUBLIC_BASE_URL}
+WORKDIR /app
+
+# Fail fast if COMMIT_SHA was not supplied: shipping the default "unknown"
+# silently poisons build metadata (footer, health checks, error reports).
+RUN if [ "$COMMIT_SHA" = "unknown" ] || [ -z "$COMMIT_SHA" ]; then \
+      echo "ERROR: COMMIT_SHA must be set via --build-arg (got '$COMMIT_SHA')" >&2; \
+      exit 1; \
+    fi
+
+# NOTE on SWC native bindings: Next.js recommends installing `libc6-compat`
+# on Alpine-based images so @next/swc-* native binaries load. We use
+# `node:20-slim` (Debian bookworm), which ships with glibc, so no compat
+# shim is required. If we ever switch to `node:20-alpine`, add:
+#   RUN apk add --no-cache libc6-compat
+
+# Copy manifests + lockfiles first for cached, reproducible installs.
+# Both showcase/scripts/ and showcase/shell-dashboard/ ship lockfiles, so
+# use `npm ci` in both stages for deterministic, reproducible installs.
+COPY showcase/scripts/package.json showcase/scripts/package-lock.json ./scripts/
+COPY showcase/shell-dashboard/package.json showcase/shell-dashboard/package-lock.json ./shell-dashboard/
+
+RUN cd scripts && npm ci --silent \
+    && cd ../shell-dashboard && npm ci --silent
+
+# Copy source
+COPY showcase/shared/ ./shared/
+COPY showcase/packages/ ./packages/
+COPY showcase/scripts/ ./scripts/
+# shell-dashboard imports generated JSON from ../../../shell/src/data/ at
+# build time (registry.json, docs-status.json, status.json). Copy the shell
+# package so those imports resolve; the generators below refresh them.
+COPY showcase/shell/ ./shell/
+COPY showcase/shell-dashboard/ ./shell-dashboard/
+
+# Bake commit info into Next.js build
+ENV NEXT_PUBLIC_COMMIT_SHA=${COMMIT_SHA}
+ENV NEXT_PUBLIC_BRANCH=${BRANCH}
+
+# Generate registry + docs status + demo content, then build Next.js.
+# Mirrors shell-dashboard/package.json "build" script exactly.
+RUN cd scripts && node node_modules/tsx/dist/cli.mjs generate-registry.ts \
+    && node node_modules/tsx/dist/cli.mjs probe-docs.ts \
+    && node node_modules/tsx/dist/cli.mjs bundle-demo-content.ts \
+    && cd ../shell-dashboard && node_modules/.bin/next build
+
+FROM node:20-slim AS runner
+# Re-declare build args in this stage so ENV interpolation below resolves.
+# ARGs do not cross stages in multi-stage builds.
+ARG COMMIT_SHA=unknown
+ARG BRANCH=unknown
+WORKDIR /app
+ENV NODE_ENV=production
+ENV PORT=10000
+ENV NEXT_PUBLIC_COMMIT_SHA=${COMMIT_SHA}
+ENV NEXT_PUBLIC_BRANCH=${BRANCH}
+
+COPY --from=builder /app/shell-dashboard/.next ./.next
+COPY --from=builder /app/shell-dashboard/node_modules ./node_modules
+COPY --from=builder /app/shell-dashboard/package.json ./
+COPY --from=builder /app/shell-dashboard/package-lock.json ./
+
+# Strip dev dependencies (tailwindcss/postcss/tsx/typescript/@types/*) from
+# the runtime image — they are only needed during `next build`.
+RUN npm prune --omit=dev
+
+EXPOSE 10000
+# Invoke next directly (no npx) to avoid runtime network fallback
+CMD ["node_modules/.bin/next", "start", "-p", "10000"]