Move to own dev image

project/dev-image/Dockerfile

@@ -0,0 +1,19 @@
+FROM ubuntu:14.04
+
+ENV GOLANG_VERSION 1.4rc1
+ENV GOPATH /var/cache/drone
+ENV GOROOT /usr/local/go
+ENV PATH $PATH:$GOROOT/bin:$GOPATH/bin
+
+ENV LANG C
+
+RUN apt-get update && apt-get install -y \
+  wget ca-certificates git mercurial bzr \
+  --no-install-recommends \
+  && rm -rf /var/lib/apt/lists/*
+
+RUN wget https://golang.org/dl/go$GOLANG_VERSION.linux-amd64.tar.gz --quiet && \
+  tar -C /usr/local -xzf go$GOLANG_VERSION.linux-amd64.tar.gz && \
+  rm go${GOLANG_VERSION}.linux-amd64.tar.gz
+
+RUN go get github.com/axw/gocov/gocov github.com/mattn/goveralls github.com/golang/lint/golint