README update, run as user

Dockerfile

@@ -19,10 +19,14 @@ RUN apk add -u -t build-tools curl git make && \
 #
 FROM alpine:latest  
 
-RUN apk --no-cache add ca-certificates
+RUN apk --no-cache add ca-certificates && \
+    addgroup -g 1000 app && \
+    adduser -h /app -s /bin/sh -G app -S -u 1000 app 
 
 WORKDIR /app
 
 COPY --from=go-builder /go/src/github.com/in4it/ecs-ssh/ecs-ssh-linux-amd64 ecs-ssh
 
+USER app
+
 CMD ["./ecs-ssh"]  

README.md

@@ -4,8 +4,10 @@ A shell frontend to ssh into ECS instances. Will display ECS cluster, services a
 # Preview
 
 # Run
+
+Run with docker, mount the ~/.aws folder (or pass the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY), mount the ssh-agent socket, and pass the environment variable for SSH agent
 ```
-docker run --rm -it -e AWS_REGION=us-east-1 in4it/ecs-ssh
+docker run --rm -it -e AWS_REGION=us-east-1 -v ~/.aws:/app/.aws -v $SSH_AUTH_SOCK:/ssh-agent -e SSH_AUTH_SOCK=/ssh-agent in4it/ecs-ssh
 ```
 
 ## Manual build