build confd myself

Dockerfile

@@ -1,3 +1,18 @@
+FROM golang:1.13.14-alpine AS builder
+
+RUN apk --no-cache add \
+    git \
+    make
+
+RUN mkdir -p $GOPATH/src/github.com/kelseyhightower
+RUN git clone https://github.com/kelseyhightower/confd.git $GOPATH/src/github.com/kelseyhightower/confd
+
+WORKDIR $GOPATH/src/github.com/kelseyhightower/confd
+RUN git checkout v0.16.0
+RUN make
+
 FROM thallian/alpine-s6:latest
 
+COPY --from=builder /go/src/github.com/kelseyhightower/confd/bin/confd /bin/confd
+
 ADD /rootfs /