Update Dockerfile

- Update rust version in docker to `1.45.2`.
- Update README.md to add examples for release docker build.

Author: aslamplr

README.md

@@ -17,11 +17,14 @@ Inspired by [Meh's blog post](https://meh.schizofreni.co/2020-04-18/comfy-web-se
 It all started here → [meh/meh.github.io#5](https://github.com/meh/meh.github.io/issues/5#issuecomment-652088596)
 
 ## To get started 
+
 Run docker-compose up to get the PostgreSQL, Redis and Adminer running Along with our Web API Service. 
 This starts the application in debug mode with auto reload on changes in the source.
+
 ```
 docker-compose up
 ```
+
 Migrations are handled using [movine](https://github.com/byronwasti/movine), This is run inside the debug start script.
 Adminer instance could be accessed from `http://localhost:8080`. Refer `docker-compose.yml` file for configurations and access credentials.
 If you are not using docker-compose to start the application, install movine using `cargo install movine`.
@@ -36,6 +39,21 @@ movine fix # assuming movine is installed, to install movine `cargo install movi
 RUST_LOG=info cargo run
 ```
 
+## Release docker build example
+
+```
+export DATABASE_URL=postgres://mydb:[email protected]:5432/mydb # this is required for the build to work, this needed for sqlx macros to verify schema
+docker build -t warp-api-release:latest -f release.Dockerfile --build-arg DATABASE_URL .
+```
+
+### Run the docker example
+
+```
+docker run --rm -it -p 3535:3535 --env-file .env -e HOST="0.0.0.0:3535" warp-api-release:latest
+```
+
+Refer `.env.sample` file for the env variables required.
+
 ## Contributions
 
 With your help we can make this a real good starter template for starting a web service.

debug.Dockerfile

@@ -1,5 +1,5 @@
 # Stage 1 - build 
-FROM rust:1.44-slim as build-deps
+FROM rust:1.45.2-slim as build-deps
 
 LABEL maintainer="[email protected]"
 LABEL version=1.0

release.Dockerfile

@@ -1,5 +1,5 @@
 # Stage 1 - build 
-FROM rust:1.44-slim as build-deps
+FROM rust:1.45.2-slim as build-deps
 
 WORKDIR /usr/src/web-app
 
@@ -10,6 +10,7 @@ RUN apt-get install -y clang llvm-dev libclang-dev
 COPY Cargo.* ./
 COPY src/ src/
 
+ARG DATABASE_URL
 RUN cargo install --path .
 
 # Stage 2 - deploy 

src/main.rs

@@ -41,7 +41,7 @@ pub struct Args {
     #[clap(short, long, env)]
     session_lifetime: Option<i64>,
 
-    #[clap(default_value = "127.0.0.1:3535")]
+    #[clap(default_value = "127.0.0.1:3535", env)]
     host: SocketAddr,
 }