Improve dockerfile (cadence-workflow#2980)

.dockerignore

@@ -1 +1,7 @@
+build/
+cadence
+cadence-server
+cadence-canary
+cadence-sql-tool
+cadence-cassandra-tool
 vendor/

Dockerfile

@@ -4,7 +4,7 @@ ARG TARGET=server
 ARG GOPROXY
 
 # Build tcheck binary
-FROM golang:1.13.3-alpine AS tcheck
+FROM golang:1.13.6-alpine AS tcheck
 
 RUN apk add --update --no-cache ca-certificates git curl
 
@@ -25,7 +25,7 @@ RUN go install
 
 
 # Build Cadence binaries
-FROM golang:1.13.3-alpine AS builder
+FROM golang:1.13.6-alpine AS builder
 
 RUN apk add --update --no-cache ca-certificates make git curl mercurial bzr
 
@@ -39,12 +39,12 @@ COPY go.* ./
 RUN go mod download
 
 COPY . .
-# need to make clean first in case binaries to be built are stale
-RUN make clean && CGO_ENABLED=0 make copyright cadence-cassandra-tool cadence-sql-tool cadence cadence-server
+
+RUN CGO_ENABLED=0 make copyright cadence-cassandra-tool cadence-sql-tool cadence cadence-server
 
 
 # Download dockerize
-FROM alpine:3.10 AS dockerize
+FROM alpine:3.11 AS dockerize
 
 RUN apk add --no-cache openssl
 
@@ -55,8 +55,9 @@ RUN wget https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSI
     && echo "**** fix for host id mapping error ****" \
     && chown root:root /usr/local/bin/dockerize
 
+
 # Alpine base image
-FROM alpine:3.10 AS alpine
+FROM alpine:3.11 AS alpine
 
 RUN apk add --update --no-cache ca-certificates tzdata bash curl