Add Dockerfile

.dockerignore

@@ -0,0 +1,4 @@
+dist/
+testpages/*
+tests/test_results.txt
+robots.html

Dockerfile

@@ -0,0 +1,24 @@
+FROM alpine:3.10 AS builder
+LABEL builder=true
+
+ENV CGO_ENABLED=0
+ENV GOPATH /go
+
+RUN apk add --update -t build-deps go git mercurial libc-dev gcc libgcc
+RUN go get github.com/ericchiang/pup \
+ && cd $GOPATH/src/github.com/ericchiang/pup \
+ && go build \
+    -a \
+    -ldflags '-s -w -extldflags "-static"' \
+    -o /bin/pup
+RUN adduser -DH user
+
+FROM scratch
+
+ENTRYPOINT [ "/pup" ]
+CMD [ "--help" ]
+
+COPY --from=builder /etc/passwd /etc/passwd
+USER user
+
+COPY --from=builder /bin/pup /pup

README.md

@@ -11,14 +11,21 @@ fast and flexible way of exploring HTML from the terminal.
 
 Direct downloads are available through the [releases page](https://github.com/EricChiang/pup/releases/latest).
 
-If you have Go installed on your computer just run `go get`.
+If you have Go installed on your computer just run `go get`:
 
     go get github.com/ericchiang/pup
 
-If you're on OS X, use [Homebrew](http://brew.sh/) to install (no Go required).
+If you're on OS X, use [Homebrew](http://brew.sh/) to install (no Go required):
 
     brew install https://raw.githubusercontent.com/EricChiang/pup/master/pup.rb
 
+If you have Docker installed, use the Docker image:
+
+    docker run --rm pup --help
+    
+    # an alias makes it even shorter
+    alias pup="docker run --rm pup"
+
 ## Quick start
 
 ```bash