adding docker README bits

Author: cutler-scott-newrelic

README.md

@@ -43,7 +43,7 @@ This project provides a set of scanners that use regular expressions to try and
 information, such as API keys, passwords, and personal information. It includes a set of regular expressions by
 default, but also accepts a JSON object containing your custom regular expressions.
 
-## How to install
+## How to install using downloaded binaries
 Download and unzip the [latest ZIP](https://github.com/newrelic/rusty-hog/releases/)
 on the releases tab. Then, run each binary with `-h` to see the usage.
 
@@ -53,6 +53,15 @@ unzip rustyhogs-musl_darwin_1.0.7.zip
 darwin_releases/choctaw_hog -h
 ```
 
+## How to run using DockerHub
+Rusty Hog Docker images can be found at the authors personal DockerHub page [here](https://hub.docker.com/u/wetfeet2000)
+A Docker Image is built for each Hog and for each release. So to use choctaw_hog you would run the following commands:
+
+```shell script
+docker pull wetfeet2000/choctaw_hog:1.0.7
+docker run -it --rm wetfeet2000/choctaw_hog:1.0.7 --help
+```
+
 ## How to build
 - Ensure you have [Rust](https://www.rust-lang.org/learn/get-started) installed and on your path.
 - Clone this repo, and then run `cargo build --release`. The binaries are located in `target/release`.

build_docker.sh

@@ -1,3 +1,5 @@
+docker system prune -a
+cargo clean
 docker build --tag wetfeet2000/ankamali_hog:$1 --build-arg HOG=ankamali .
 docker push wetfeet2000/ankamali_hog:$1
 docker build --tag wetfeet2000/berkshire_hog:$1 --build-arg HOG=berkshire .