Merge pull request #99 from yanshiyason/patch-1

Update deployment.md

guides/deployment.md

@@ -14,3 +14,19 @@ For example:
 heroku buildpacks:add -i 1 https://github.com/emk/heroku-buildpack-rust.git
 echo "RUST_SKIP_BUILD=1" > RustConfig
 ```
+
+### Deploying with Docker
+
+Make sure rust is installed prior to running `mix deps.compile`. You can see examples of what commands to include in your Dockerfile by looking at the official rust Dockerfiles. For example, here are the commands for [`alpine3.11`](https://github.com/rust-lang/docker-rust/blob/009cc0a821ff773d54875350312731ed490d5cce/1.43.1/alpine3.11/Dockerfile) based images.
+
+If your Dockerfile is separated into a `build stage` and a `release stage` rust only needs to be installed during the build phase. **However**, your image will need to have `libcc` installed during the `release stage`.
+
+```
+RUN apk add --no-cache libgcc
+```
+
+You will also need to have the folloing environment variable set during the `build` stage or else `mix compile` will fail.
+
+```
+RUSTFLAGS='--codegen target-feature=-crt-static'
+```