add ui

Dockerfile

@@ -1,3 +1,23 @@
+# Stage 1: compile the re-frame UI (ui/) to JS. shadow-cljs needs Node and a JVM. It writes
+# to ../resources/public/js (see ui/shadow-cljs.edn), i.e. /build/resources/public/js here.
+# trixie, not bookworm: its default-jre is Java 21, which shadow-cljs's Closure Compiler
+# requires (bookworm's is 17 -> UnsupportedClassVersionError).
+FROM node:22-trixie-slim AS ui
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends default-jre-headless \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /build/ui
+COPY ui/package.json ui/package-lock.json ./
+RUN npm ci
+# Resolve the ClojureScript deps in their own layer so source edits don't re-download them.
+COPY ui/shadow-cljs.edn ./
+RUN npx shadow-cljs classpath > /dev/null
+COPY ui/src ./src
+RUN npx shadow-cljs release app
+
+# Stage 2: the server.
 FROM clojure:openjdk-11-tools-deps
 
 RUN sed -i \
@@ -17,6 +37,7 @@ RUN clojure -P -X:${DEPS_ALIASES} \
     && echo "[build] cached jars: $(find /root/.m2 -name '*.jar' | wc -l)"
 
 COPY . .
+COPY --from=ui /build/resources/public/js resources/public/js
 
 EXPOSE 3000