feat: add Dockerfile

Dockerfile

@@ -0,0 +1,40 @@
+FROM rust:1.57 as builder
+
+RUN USER=root cargo new --bin nostr-rs-relay
+WORKDIR ./nostr-rs-relay
+COPY ./Cargo.toml ./Cargo.toml
+COPY ./Cargo.lock ./Cargo.lock
+RUN cargo build --release
+RUN rm src/*.rs
+
+COPY ./src ./src
+
+RUN rm ./target/release/deps/nostr*relay*
+RUN cargo build --release
+
+FROM debian:buster-slim
+ARG APP=/usr/src/app
+
+RUN apt-get update \
+    && apt-get install -y ca-certificates tzdata sqlite3 \
+    && rm -rf /var/lib/apt/lists/*
+
+EXPOSE 8080
+
+ENV TZ=Etc/UTC \
+    APP_USER=appuser
+
+RUN groupadd $APP_USER \
+    && useradd -g $APP_USER $APP_USER \
+    && mkdir -p ${APP}
+
+COPY --from=builder /nostr-rs-relay/target/release/nostr-rs-relay ${APP}/nostr-rs-relay
+
+RUN chown -R $APP_USER:$APP_USER ${APP}
+
+USER $APP_USER
+WORKDIR ${APP}
+
+ENV RUST_LOG=info
+
+CMD ["./nostr-rs-relay"]