Add Dockerfile as example for server with frontend

.dockerignore

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+frontend/node_modules
+frontend/.parcel-cache
+target/debug
+

Dockerfile

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+# 1. BUILD-CONTAINER: Frontend
+FROM node:gallium-alpine
+
+WORKDIR /root
+
+COPY ./frontend /root
+
+RUN yarn && yarn build
+
+# 2. BUILD-CONTAINER: Server
+FROM rust:alpine
+
+WORKDIR /root
+
+RUN apk add --no-cache musl-dev
+
+COPY ./bin /root/bin
+COPY ./lib /root/lib
+COPY ./server /root/server
+COPY ./Cargo.toml /root/Cargo.toml
+COPY ./Cargo.lock /root/Cargo.lock
+
+RUN cargo build --workspace --release
+
+# 3. RUNTIME-CONTAINER: run server with frontend as assets
+FROM alpine:latest
+
+WORKDIR /root
+
+COPY --from=0 /root/dist /root/assets
+COPY --from=1 /root/target/release/adf-bdd-server /root/server
+
+ENTRYPOINT ["./server"]
+