added deployment via docker compose

backend/Dockerfile

@@ -0,0 +1,47 @@
+FROM docker.io/rust:1-slim-bookworm AS build
+
+## cargo package name: customize here or provide via --build-arg
+ARG pkg=backend
+ARG DATABASE_URL
+
+WORKDIR /build
+
+COPY .cargo .cargo
+COPY cdn cdn
+COPY src src
+COPY Cargo.toml Cargo.toml
+COPY Rocket.toml Rocket.toml
+COPY static static
+COPY templates templates
+
+RUN apt-get update && apt-get install -y libssl-dev pkg-config
+
+RUN --mount=type=cache,target=/build/target \
+    --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/usr/local/cargo/git \
+    set -eux; \
+    cargo build --release; \
+    objcopy --compress-debug-sections target/release/$pkg ./main
+
+################################################################################
+
+FROM docker.io/debian:bookworm-slim
+
+RUN apt-get update && apt-get install -y libssl-dev pkg-config
+
+WORKDIR /app
+
+## copy the main binary
+COPY --from=build /build/main ./
+
+## copy runtime assets which may or may not exist
+COPY --from=build /build/Rocket.toml ./Rocket.toml
+COPY --from=build /build/static ./static
+COPY --from=build /build/cdn ./cdn
+COPY --from=build /build/template[s] ./templates
+
+## ensure the container listens globally on port 8000
+ENV ROCKET_ADDRESS=0.0.0.0
+ENV ROCKET_PORT=8000
+
+CMD ./main