use alpine 3.4

Dockerfile

@@ -1,3 +1,17 @@
-FROM smebberson/alpine-confd:latest
+FROM smebberson/alpine-base:latest
+
+ENV CONFD_VERSION=0.11.0
+
+RUN apk add --no-cache go git gcc musl-dev && \
+    git clone https://github.com/kelseyhightower/confd.git /src/confd && \
+    cd /src/confd && \
+    git checkout -q --detach "v$CONFD_VERSION" && \
+    cd /src/confd/src/github.com/kelseyhightower/confd && \
+    GOPATH=/src/confd/vendor:/src/confd go build -a -installsuffix cgo -ldflags '-extld ld -extldflags -static' -x . && \
+    mv ./confd /bin/ && \
+    chmod +x /bin/confd && \
+    apk del go git gcc musl-dev && \
+rm -rf /src
 
 ADD /root /
+