Add Dockerfile for building the official CLI container

Dockerfile

@@ -0,0 +1,20 @@
+FROM golang:1.9 as builder
+
+RUN go get -u github.com/kardianos/govendor
+
+WORKDIR /go/src/mikefarah/yq
+
+COPY . /go/src/mikefarah/yq
+
+RUN govendor sync
+
+RUN CGO_ENABLED=0 go build
+
+# Choose alpine as a base image to make this useful for CI, as many
+# CI tools expect an interactive shell inside the container
+FROM alpine:3.7
+
+COPY --from=builder /go/src/mikefarah/yq/yq /usr/bin/yq
+RUN chmod +x /usr/bin/yq
+
+WORKDIR /workdir

README.md

@@ -17,6 +17,20 @@ or, [Download latest binary](https://github.com/mikefarah/yq/releases/latest) or
 go get github.com/mikefarah/yq
 ```
 
+## Run with Docker
+
+Oneshot use:
+
+```bash
+docker run -v ${PWD}:/workdir mikefarah/yq yq [flags] <command> FILE...
+```
+
+Run commands interactively:
+
+```bash
+docker run -it -v ${PWD}:/workdir mikefarah/yq sh
+```
+
 ## Features
 - Written in portable go, so you can download a lovely dependency free binary
 - Deep read a yaml file with a given path