Add frontend Dockerfile

Create a container image with the static site so we can deploy to
Hetzner instead of Azure static web apps.

To test:

podman build . --file frontend.Dockerfile --tag coco
podman run --publish 80:8080 coco

And visit http://localhost

Author: Erikvv

webtool/frontend.Dockerfile

@@ -0,0 +1,37 @@
+# Create a container image which serves a static site
+
+# Build stage 1
+FROM docker.io/library/gradle:8.13-jdk21 AS gradle
+
+COPY gradle /home/gradle/gradle
+WORKDIR /home/gradle/gradle
+
+RUN --mount=type=cache,target=/home/gradle/.gradle/caches gradle jsBrowserProductionLibraryDistribution
+
+# Build stage 2
+FROM docker.io/library/node:25.1.0 AS nodejs
+
+WORKDIR /app/frontend
+
+# minimal layer so we can cache node_modules
+COPY frontend/package.json frontend/package-lock.json /app/frontend/
+RUN npm install
+
+COPY --from=gradle /home/gradle/gradle/build/js/packages/local4local-common /app/gradle/build/js/packages/local4local-common
+
+ARG VITE_BACKEND_URL=https://local4local-backend.zenmo.com
+ARG VITE_ANYLOGIC_CALLBACK_URL=https://local4local-backend.zenmo.com
+
+# Build static site
+COPY frontend /app/frontend
+RUN ls -ahl
+RUN npm run build
+
+# Final image
+FROM docker.io/pierrezemb/gostatic:latest
+
+COPY --from=nodejs /app/frontend/dist /srv/http
+
+EXPOSE 8080
+
+CMD ["-log-level", "debug", "-fallback", "index.html", "-port", "8080"]

webtool/frontend.dockerignore

@@ -0,0 +1,2 @@
+frontend/dist
+frontend/node_modules