docker: make 'lnd' dockerfile download project from github rather tha…

…n mount it localy

docker/lnd/Dockerfile

@@ -2,18 +2,24 @@ FROM golang:1.7
 
 MAINTAINER Olaoluwa Osuntokun <[email protected]>
 
-# TODO(roasbeef): just mount a volume from the build context to the GOPATH?
-ADD . /go/src/github.com/lightningnetwork/lnd
-WORKDIR /go/src/github.com/lightningnetwork/lnd
+# Expose lnd ports (server, rpc).
+EXPOSE 10011 10009
 
 # Force Go to use the cgo based DNS resolver. This is required to ensure DNS
 # queries required to connect to linked containers succeed.
 ENV GODEBUG netdns=cgo
 
-RUN go build
-RUN go install . ./cmd/...
+# Install glide to manage vendor.
+RUN go get -u github.com/Masterminds/glide
 
-# Expose lnd ports (server, rpc).
-EXPOSE 10011 10009
+# Grab and install the latest version of lnd and all related dependencies.
+RUN git clone https://github.com/lightningnetwork/lnd $GOPATH/src/github.com/lightningnetwork/lnd
+
+# Make lnd folder default.
+WORKDIR $GOPATH/src/github.com/lightningnetwork/lnd
+
+# Instll dependency and install/build lnd.
+RUN glide install
+RUN go install . ./cmd/...
 
 COPY "docker/lnd/start-lnd.sh" .