Dockerfile updated for zxplay.org

Author: stever

apps/play/Dockerfile

@@ -1,12 +1,15 @@
-FROM caddy:2 AS base
-COPY Caddyfile /etc/caddy/Caddyfile
-
-FROM node:19 AS npmbuild
-WORKDIR /project
-COPY . .
-RUN npm install --force
-RUN npm run build
-
-FROM base AS final
-COPY --from=npmbuild /project/public /srv
-RUN sed -i "s|ver=0|"ver=`date +"%s"`"|g" /srv/index.html
+FROM caddy:2 AS base
+COPY apps/play/Caddyfile /etc/caddy/Caddyfile
+
+FROM node:22 AS npmbuild
+WORKDIR /project
+# Build context is the repo root so the workspace + @zxplay/emulator are present.
+COPY . .
+RUN npm install --legacy-peer-deps
+# Builds @zxplay/emulator then apps/play (its build script chains both).
+RUN npm run build -w play
+
+FROM base AS final
+COPY --from=npmbuild /project/apps/play/public /srv
+# Cache-bust the static bundle reference per build.
+RUN sed -i "s|ver=0|ver=$(date +%s)|g" /srv/index.html