Reduce docker context to improve build times

.dockerignore

@@ -1 +1,5 @@
 Dockerfile.dev
+docs
+vendor
+.git
+oauth2-proxy

CHANGELOG.md

@@ -8,6 +8,7 @@
 
 ## Changes since v6.0.0
 
+- [#669](https://github.com/oauth2-proxy/oauth2-proxy/pull/669) Reduce docker context to improve build times (@JoelSpeed)
 - [#668](https://github.com/oauth2-proxy/oauth2-proxy/pull/668) Use req.Host in --force-https when req.URL.Host is empty (@zucaritask)
 - [#660](https://github.com/oauth2-proxy/oauth2-proxy/pull/660) Use builder pattern to simplify requests to external endpoints (@JoelSpeed)
 - [#591](https://github.com/oauth2-proxy/oauth2-proxy/pull/591) Introduce upstream package with new reverse proxy implementation (@JoelSpeed)

Dockerfile

@@ -1,4 +1,5 @@
 FROM golang:1.14-buster AS builder
+ARG VERSION
 
 # Download tools
 RUN curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.24.0
@@ -19,7 +20,7 @@ COPY . .
 #  build the key into the container and then tell it where it is
 #  by setting OAUTH2_PROXY_JWT_KEY_FILE=/etc/ssl/private/jwt_signing_key.pem
 #  in app.yaml instead.
-RUN make build && touch jwt_signing_key.pem
+RUN VERSION=${VERSION} make build && touch jwt_signing_key.pem
 
 # Copy binary to alpine
 FROM alpine:3.11

Dockerfile.arm64

@@ -1,4 +1,5 @@
 FROM golang:1.14-buster AS builder
+ARG VERSION
 
 # Download tools
 RUN curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.24.0
@@ -19,7 +20,7 @@ COPY . .
 #  build the key into the container and then tell it where it is
 #  by setting OAUTH2_PROXY_JWT_KEY_FILE=/etc/ssl/private/jwt_signing_key.pem
 #  in app.yaml instead.
-RUN GOARCH=arm64 make build && touch jwt_signing_key.pem
+RUN VERSION=${VERSION} GOARCH=arm64 make build && touch jwt_signing_key.pem
 
 # Copy binary to alpine
 FROM arm64v8/alpine:3.11

Dockerfile.armv6

@@ -1,4 +1,5 @@
 FROM golang:1.14-buster AS builder
+ARG VERSION
 
 # Download tools
 RUN curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.24.0
@@ -19,7 +20,7 @@ COPY . .
 #  build the key into the container and then tell it where it is
 #  by setting OAUTH2_PROXY_JWT_KEY_FILE=/etc/ssl/private/jwt_signing_key.pem
 #  in app.yaml instead.
-RUN GOARCH=arm GOARM=6 make build && touch jwt_signing_key.pem
+RUN VERSION=${VERSION} GOARCH=arm GOARM=6 make build && touch jwt_signing_key.pem
 
 # Copy binary to alpine
 FROM arm32v6/alpine:3.11

Makefile

@@ -2,7 +2,7 @@ GO ?= go
 GOLANGCILINT ?= golangci-lint
 
 BINARY := oauth2-proxy
-VERSION := $(shell git describe --always --dirty --tags 2>/dev/null || echo "undefined")
+VERSION ?= $(shell git describe --always --dirty --tags 2>/dev/null || echo "undefined")
 # Allow to override image registry.
 REGISTRY ?= quay.io/oauth2-proxy
 .NOTPARALLEL:
@@ -13,6 +13,8 @@ MINIMUM_SUPPORTED_GO_MAJOR_VERSION = 1
 MINIMUM_SUPPORTED_GO_MINOR_VERSION = 14
 GO_VERSION_VALIDATION_ERR_MSG = Golang version is not supported, please update to at least $(MINIMUM_SUPPORTED_GO_MAJOR_VERSION).$(MINIMUM_SUPPORTED_GO_MINOR_VERSION)
 
+DOCKER_BUILD := docker build --build-arg VERSION=${VERSION}
+
 ifeq ($(COVER),true)
 TESTCOVER ?= -coverprofile c.out
 endif
@@ -41,17 +43,17 @@ $(BINARY):
 
 .PHONY: docker
 docker:
-	docker build -f Dockerfile -t $(REGISTRY)/oauth2-proxy:latest .
+	$(DOCKER_BUILD) -f Dockerfile -t $(REGISTRY)/oauth2-proxy:latest .
 
 .PHONY: docker-all
 docker-all: docker
-	docker build -f Dockerfile -t $(REGISTRY)/oauth2-proxy:latest-amd64 .
+	$(DOCKER_BUILD) -f Dockerfile -t $(REGISTRY)/oauth2-proxy:latest-amd64 .
-	docker build -f Dockerfile -t $(REGISTRY)/oauth2-proxy:${VERSION} .
+	$(DOCKER_BUILD) -f Dockerfile -t $(REGISTRY)/oauth2-proxy:${VERSION} .
-	docker build -f Dockerfile -t $(REGISTRY)/oauth2-proxy:${VERSION}-amd64 .
+	$(DOCKER_BUILD) -f Dockerfile -t $(REGISTRY)/oauth2-proxy:${VERSION}-amd64 .
-	docker build -f Dockerfile.arm64 -t $(REGISTRY)/oauth2-proxy:latest-arm64 .
+	$(DOCKER_BUILD) -f Dockerfile.arm64 -t $(REGISTRY)/oauth2-proxy:latest-arm64 .
-	docker build -f Dockerfile.arm64 -t $(REGISTRY)/oauth2-proxy:${VERSION}-arm64 .
+	$(DOCKER_BUILD) -f Dockerfile.arm64 -t $(REGISTRY)/oauth2-proxy:${VERSION}-arm64 .
-	docker build -f Dockerfile.armv6 -t $(REGISTRY)/oauth2-proxy:latest-armv6 .
+	$(DOCKER_BUILD) -f Dockerfile.armv6 -t $(REGISTRY)/oauth2-proxy:latest-armv6 .
-	docker build -f Dockerfile.armv6 -t $(REGISTRY)/oauth2-proxy:${VERSION}-armv6 .
+	$(DOCKER_BUILD) -f Dockerfile.armv6 -t $(REGISTRY)/oauth2-proxy:${VERSION}-armv6 .
 
 .PHONY: docker-push
 docker-push: