Add Dockerfile

Dockerfile

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+FROM node:23-slim AS frontend-builder
+RUN corepack enable
+WORKDIR /frontend
+COPY crates/frontend/frontend/package.json /frontend/package.json
+RUN pnpm install
+COPY crates/frontend/frontend /frontend
+RUN pnpm build
+# Templates will be in /frontend/dist/templates
+# Assets will be in /frontend/dist/assets
+
+
+FROM rust:1.82-alpine AS builder
+# We need to statically link C dependencies like sqlite, otherwise we get
+# exec /usr/local/bin/rustical: no such file or directory
+# x86_64-unknown-linux-musl does static linking by default
+RUN apk add --no-progress build-base; \
+    rustup target add x86_64-unknown-linux-musl
+WORKDIR /rustical
+COPY . .
+COPY --from=frontend-builder /frontend/dist crates/frontend/frontend/dist
+RUN --mount=type=cache,target=target cargo install --target x86_64-unknown-linux-musl --path .
+
+FROM scratch
+COPY --from=builder /usr/local/cargo/bin/rustical /usr/local/bin/rustical
+CMD ["/usr/local/bin/rustical"]
+
+LABEL org.opencontainers.image.authors="Lennart K github.com/lennart-k"
+EXPOSE 4000