Create Dockerfile

https://raw.githubusercontent.com/svengo/docker-watchtower/master/Dockerfile

Dockerfile

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+#
+# Builder
+#
+
+FROM golang:alpine as builder
+ARG SOURCE=itsthejb
+RUN \
+  apk add --no-cache \
+    alpine-sdk \
+    ca-certificates \
+    git \
+    tzdata && \
+  \
+  mkdir --parents $GOPATH/src/github.com/${SOURCE} && \
+  cd $GOPATH/src/github.com/${SOURCE} && \
+  git clone https://github.com/${SOURCE}/watchtower.git && \
+  cd watchtower && \
+  \
+  curl https://glide.sh/get | sh && \
+  glide install && \
+  \
+  CGO_ENABLED=0 GOOS=linux go build -a -ldflags '-extldflags "-static"' . && \
+  go test
+
+
+#
+# watchtower
+#
+
+FROM scratch
+
+LABEL "com.centurylinklabs.watchtower"="true"
+
+# copy files from other container
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
+COPY --from=builder /go/src/github.com/${SOURCE}/watchtower/watchtower /watchtower
+
+ENTRYPOINT ["/watchtower"]