Changed dockerfile, build is now passing

Dockerfile

@@ -1,20 +1,49 @@
+##
+## Alpine image to get some needed data
+##
+#FROM alpine:latest as alpine
+#RUN apk add --no-cache \
+#    ca-certificates \
+#    tzdata
 #
-# Alpine image to get some needed data
+##
+## Image
+##
+#FROM scratch
+#LABEL "com.centurylinklabs.watchtower"="true"
 #
-FROM alpine:latest as alpine
+## copy files from other containers
+#COPY --from=alpine /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+#COPY --from=alpine /usr/share/zoneinfo /usr/share/zoneinfo
+#
+#COPY watchtower /
+#ENTRYPOINT ["/watchtower"]
+
+# build stage
+FROM golang:alpine AS build-env
+
+RUN apk add --no-cache openssh-client git curl
+
+RUN curl https://glide.sh/get | sh
+
+WORKDIR /go/src/github.com/v2tec/watchtower
+COPY . .
+
+# RUN set -x && \
+#     go get github.com/golang/dep/cmd/dep && \
+#     dep ensure -v
+RUN glide install
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o watchtower .
+# RUN go build -o watchtower .
+
+# final stage
+FROM alpine
+LABEL "com.centurylinklabs.watchtower"="true"
+
 RUN apk add --no-cache \
     ca-certificates \
     tzdata
 
-#
-# Image
-#
-FROM scratch
-LABEL "com.centurylinklabs.watchtower"="true"
-
-# copy files from other containers
-COPY --from=alpine /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
-COPY --from=alpine /usr/share/zoneinfo /usr/share/zoneinfo
-
-COPY watchtower /
-ENTRYPOINT ["/watchtower"]
+COPY --from=build-env /go/src/github.com/v2tec/watchtower/watchtower /
+ENTRYPOINT ["/watchtower"]