Refactor Dockerfile to make build more cacheable (#50)

* Refactor Dockerfile to make build more cacheable

* Try an edit

.dockerignore

@@ -0,0 +1,2 @@
+k8s-ecr-login-renew
+k8s-ecr-login-renew.*

.gitignore

@@ -1,5 +1,5 @@
 .vs
 .idea
-k8s-ecr-login-renew.exe
+k8s-ecr-login-renew.*
 k8s-ecr-login-renew
 *~

Dockerfile

@@ -1,12 +1,16 @@
 # syntax=docker/dockerfile:1
 FROM golang:1.20-alpine AS build
 WORKDIR /go/src/app
-ADD . /go/src/app
-RUN go get -d -v ./...
+COPY go.mod /go/src/app/
+COPY go.sum /go/src/app/
+RUN go mod download
+
+COPY . .
 RUN go build -o /go/bin/app
 
 FROM alpine:3.17
 RUN addgroup -S -g 1001 appgroup && adduser -S -u 1001 -G appgroup appuser
 USER appuser
+
 COPY --from=build /go/bin/app /k8s-ecr-login-renew
 CMD ["/k8s-ecr-login-renew"]

go.mod

@@ -1,9 +1,10 @@
-module github.com/nabsul/k8s-ecr-login-renew
+module k8s-ecr-login-renew
 
 go 1.20
 
 require (
 	github.com/aws/aws-sdk-go v1.44.219
+	github.com/nabsul/k8s-ecr-login-renew v1.7.1
 	k8s.io/api v0.26.2
 	k8s.io/apimachinery v0.26.2
 	k8s.io/client-go v0.26.2

go.sum

@@ -101,6 +101,8 @@ github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9G
 github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
+github.com/nabsul/k8s-ecr-login-renew v1.7.1 h1:M+e/S4rhBMn49yGPNUOrS+UoCr29Gbn5OqG13qDhtmA=
+github.com/nabsul/k8s-ecr-login-renew v1.7.1/go.mod h1:7PONzlU4Y8Oeh3CAVtUIQ2fV43glcgV6UooJg8ugypU=
 github.com/onsi/ginkgo/v2 v2.4.0 h1:+Ig9nvqgS5OBSACXNk15PLdp0U9XPYROt9CFzVdFGIs=
 github.com/onsi/gomega v1.23.0 h1:/oxKu9c2HVap+F3PfKort2Hw5DEU+HGlW8n+tguWsys=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=

main.go

@@ -3,8 +3,8 @@ package main
 import (
 	"errors"
 	"fmt"
-	"github.com/nabsul/k8s-ecr-login-renew/src/aws"
-	"github.com/nabsul/k8s-ecr-login-renew/src/k8s"
+	"k8s-ecr-login-renew/src/aws"
+	"k8s-ecr-login-renew/src/k8s"
 	"os"
 	"strings"
 	"time"