Add Docker support

Author: SakaDream

Dockerfile

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+# build stage
+FROM rustlang/rust:nightly-slim as build
+
+# install libpq
+RUN apt-get update
+RUN apt-get install -y libpq-dev
+RUN rm -rf /var/lib/apt/lists/*
+
+# create new empty binary project
+RUN USER=root cargo new --bin app
+WORKDIR /app
+
+# copy manifests
+COPY ./Cargo.toml ./Cargo.toml
+
+# build this project to cache dependencies
+RUN cargo build --release
+RUN rm src/*.rs
+
+# copy project source and necessary files
+COPY ./src ./src
+COPY ./migrations ./migrations
+COPY ./diesel.toml .
+
+# add .env and secret.key for Docker env
+RUN touch .env
+RUN mv src/secret.key.sample src/secret.key
+
+# rebuild app with project source
+RUN rm ./target/release/deps/actix_web_rest_api_with_jwt*
+RUN cargo build --release
+
+# deploy stage
+FROM debian:stretch-slim
+
+# create app directory
+RUN mkdir app
+WORKDIR /app
+
+# install libpq
+RUN apt-get update
+RUN apt-get install -y libpq-dev
+RUN rm -rf /var/lib/apt/lists/*
+
+# copy binary and configuration files
+COPY --from=build /app/target/release/actix-web-rest-api-with-jwt .
+COPY --from=build /app/.env .
+COPY --from=build /app/diesel.toml .
+
+# expose port
+EXPOSE 8000
+
+# run the binary
+ENTRYPOINT ["/app/actix-web-rest-api-with-jwt"]

docker-compose.yml

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+version: '3'
+services:
+  db:
+    container_name: address_book_db
+    image: postgres
+    restart: always
+    ports:
+    - "5432:5432"
+    environment:
+    - POSTGRES_PASSWORD=postgres
+  app:
+    build: .
+    restart: always
+    ports:
+    - "8000:8000"
+    environment:
+    - APP_HOST=0.0.0.0
+    - APP_PORT=8000
+    - DATABASE_URL=postgres://postgres:postgres@db/postgres
+    depends_on:
+    - db