Update Dockerfile with Tailwind build stage and prod database

Add Node.js stage for CSS build, cache Clojure deps in separate layer,
add .dockerignore, and default JDBC_URL to btcprod database.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -1,8 +1,21 @@
+FROM node:22-alpine AS css
+
+WORKDIR /build
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY resources/css/ resources/css/
+COPY src/ src/
+COPY tailwind.config.js ./
+RUN npm run css:build
+
 FROM clojure:openjdk-25 AS build
 
 WORKDIR /build
+COPY deps.edn build.clj ./
+RUN clj -Sforce -P
 COPY . .
-RUN clj -Sforce -T:build all
+COPY --from=css /build/resources/public/css/output.css resources/public/css/output.css
+RUN clj -T:build all
 
 FROM azul/zulu-openjdk-alpine:25
 
@@ -10,5 +23,6 @@ COPY --from=build /build/target/btcprice-standalone.jar /btcprice/btcprice-stand
 
 EXPOSE 4040
 ENV PORT=4040
+ENV JDBC_URL=jdbc:postgresql://postgres:5432/btcprod
 
 CMD ["java", "-jar", "/btcprice/btcprice-standalone.jar"]