fix(build/doc): update dockerfile and readme (bytebeamio#631)

* fix(Dockerfile): don't include default config because its part of binary

* fix(docs): add instruction about how to pass custom config to docker

* update root readme as well

Dockerfile

@@ -6,6 +6,5 @@ RUN cargo build --release -p rumqttd
 
 FROM alpine:latest
 COPY --from=builder /usr/src/rumqtt/target/release/rumqttd /usr/local/bin/rumqttd
-COPY ./rumqttd/rumqttd.toml .
 ENV RUST_LOG="info"
 ENTRYPOINT ["rumqttd"]

README.md

@@ -48,14 +48,14 @@ rumqttd can be used with docker by pulling the image from docker hub as follows:
 docker pull bytebeamio/rumqttd
 ```
 
-To use the rumqttd docker image with the included `rumqttd.toml` while exposing the necessary ports for clients to interact with the broker, use the following command:
+To run rumqttd docker image you can simply run:
 ```bash
-docker run -p 1883:1883 -p 1884:1884 -it bytebeamio/rumqttd -c rumqttd.toml
+docker run -p 1883:1883 -p 1884:1884 -it bytebeamio/rumqttd
 ```
 
-One can also mount the local directory containing configs as a volume and use the appropriate config file as follows:
+Or you can run `rumqttd` with the custom config file by mounting the file and passing it as argument:
 ```bash
-docker run -v /path/to/configs:/configs -p 1883:1883 -it bytebeamio/rumqttd -c /configs/config.toml
+docker run -p 1883:1883 -p 1884:1884 -v /absolute/path/to/rumqttd.toml:/rumqttd.toml -it rumqttd -c /rumqttd.toml
 ```
 
 <br/>

rumqttd/README.md

@@ -20,10 +20,18 @@ Example config file is provided on the root of the repo.
 
 #### Building the docker image
 
-In order to run rumqttd within a docker container, build the image by running `build_rumqttd_docker.sh` from the project's root directory. The shell script will use docker to build rumqttd and package it along in an [alpine](https://hub.docker.com/_/alpine) image. You can then run `rumqttd` with the included `rumqttd.toml` as follows(ensure you are in the project's root directory):
+In order to run rumqttd within a docker container, build the image by running `build_rumqttd_docker.sh` from the project's root directory. The shell script will use docker to build rumqttd and package it along in an [alpine](https://hub.docker.com/_/alpine) image. You can then run `rumqttd` using default config with:
+
+```bash
+./build_rumqttd_docker.sh
+docker run -p 1883:1883 -p 1884:1884 -it rumqttd
+```
+
+Or you can run `rumqttd` with the custom config file by mounting the file and passing it as argument:
+
 ```bash
 ./build_rumqttd_docker.sh
-docker run -p 1883:1883 -p 1884:1884 -it rumqttd -c rumqttd.toml
+docker run -p 1883:1883 -p 1884:1884 -v /absolute/path/to/rumqttd.toml:/rumqttd.toml -it rumqttd -c /rumqttd.toml
 ```
 
 # How to use with TLS