auto-build docker image via docker hub

Dockerfile

@@ -1,12 +1,13 @@
-FROM alpine:latest
+FROM golang:alpine
 
 EXPOSE 53
 
 RUN apk --no-cache add ca-certificates && update-ca-certificates
 
-# link shared libs in place for go binary
-RUN mkdir /lib64 && ln -s /lib/libc.musl-x86_64.so.1 /lib64/ld-linux-x86-64.so.2
+RUN mkdir -p /go/src/github.com/fardog/secureoperator
+COPY . /go/src/github.com/fardog/secureoperator
 
-COPY release/secure-operator_linux-amd64 /usr/local/bin/secure-operator
+WORKDIR /go/src/github.com/fardog/secureoperator/cmd/secure-operator
+RUN go install -v
 
 CMD secure-operator --listen 0.0.0.0:53

README.md

@@ -36,9 +36,12 @@ There is a [Docker][docker] image available for secureoperator:
 docker pull fardog/secureoperator
 ```
 
-The `latest` tag will always be the most recently tagged release. For now these
-builds are being done manually, so if they are out of date please
-[file an issue][issues] so that I can get them updated.
+The `latest` tag will always be the build from the `master` branch. If you wish
+to use one of the stable releases, use its version tag when pulling, e.g.:
+
+```
+docker pull fardog/secureoperator:v1.0.2
+```
 
 ## Security