Add Docker image and compose for Needle web exports

Serve production Vite dist with nginx; optional SampleScene profile.

Made-with: Cursor

Dockerfile

@@ -0,0 +1,32 @@
+# Needle Engine web export (Vite) → static nginx
+#
+# Prerequisites before `docker build`:
+#   - Export your scene from Unity so Needle/MenuScene (or SampleScene) contains:
+#     - src/generated/ (gen.js, register_types, etc.)
+#     - assets/ with your .glb and any files the Vite build copies
+#   - `npm run build` should succeed locally for the same NEEDLE_APP.
+#
+# Build needs network: Needle's build may verify license against needle.tools.
+
+FROM node:22-alpine AS build
+WORKDIR /build
+
+ARG NEEDLE_APP=MenuScene
+ENV NEEDLE_APP=${NEEDLE_APP}
+
+COPY Needle/${NEEDLE_APP}/package.json Needle/${NEEDLE_APP}/package-lock.json ./
+RUN npm ci
+
+COPY Needle/${NEEDLE_APP}/ ./
+
+RUN npm run build
+
+FROM nginx:1.27-alpine AS runtime
+
+COPY --from=build /build/dist /usr/share/nginx/html
+COPY docker/nginx-default.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=5s --retries=3 \
+  CMD wget -q -O /dev/null http://127.0.0.1/ || exit 1