From 53dcd7617703f3372ffbb730e14e8ec6a769bfaa Mon Sep 17 00:00:00 2001
From: Lyra Naeseth <lyra@lyra.codes>
Date: Thu, 8 Sep 2022 15:39:47 -0700
Subject: [PATCH 1/3] Build an arm64 container image

---
 Dockerfile | 8 +++++---
 Makefile   | 7 +++++++
 2 files changed, 12 insertions(+), 3 deletions(-)
 create mode 100644 Makefile

diff --git a/Dockerfile b/Dockerfile
index 5d795c9..db49725 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,11 +1,13 @@
-FROM golang:1.18.3 as builder
+FROM --platform=${BUILDPLATFORM} golang:1.18.3 as builder
+ARG TARGETARCH
+ARG TARGETOS
 WORKDIR /go/src/github.com/max-rocket-internet/k8s-event-logger
 COPY . .
 RUN go get
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o k8s-event-logger
+RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -o k8s-event-logger
 RUN adduser --disabled-login --no-create-home --disabled-password --system --uid 101 non-root
 
-FROM alpine:3.15.4
+FROM --platform=${TARGETPLATFORM} alpine:3.15.4
 RUN addgroup -S non-root && adduser -S -G non-root non-root
 USER 101
 ENV USER non-root
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..90aab4f
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,7 @@
+VERSION ?= 1.6.1
+IMG ?= maxrocketinternet/k8s-event-logger:$(VERSION)
+
+.PHONY: image
+
+image:
+	docker buildx build --platform linux/amd64,linux/arm64 --push -t $(IMG) .

From e64af6983d5f0054606a93d399648ec275330734 Mon Sep 17 00:00:00 2001
From: Lyra Naeseth <lyra@lyra.codes>
Date: Thu, 15 Sep 2022 12:47:53 -0700
Subject: [PATCH 2/3] Let the container image build be further customized

---
 Makefile | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 90aab4f..4beb41c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,8 @@
-VERSION ?= 1.6.1
-IMG ?= maxrocketinternet/k8s-event-logger:$(VERSION)
+IMG ?= maxrocketinternet/k8s-event-logger
+TAG ?= 1.6
+PLATFORMS ?= linux/amd64,linux/arm64
 
 .PHONY: image
 
 image:
-	docker buildx build --platform linux/amd64,linux/arm64 --push -t $(IMG) .
+	docker buildx build --platform $(PLATFORMS) --push -t $(IMG):$(TAG) .

From 5af0b1b328d886a1fe2c3c2b101136b0249a44dd Mon Sep 17 00:00:00 2001
From: Lyra Naeseth <lyra@lyra.codes>
Date: Thu, 15 Sep 2022 12:48:06 -0700
Subject: [PATCH 3/3] Add a README section on image builds

---
 README.md | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 80d8ed5..90fe37c 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,22 @@ Use the [Helm](https://helm.sh/) chart:
 helm install chart/
 ```
 
-Or user the docker image [maxrocketinternet/k8s-event-logger](https://hub.docker.com/r/maxrocketinternet/k8s-event-logger)
+Or use the docker image [maxrocketinternet/k8s-event-logger][image]
+
+[image]: https://hub.docker.com/r/maxrocketinternet/k8s-event-logger
+
+#### Building a container image
+
+If you're unable to use the [prebuilt][image] docker image, you can build it yourself:
+
+```sh
+make IMG=your.docker.registry/k8s-event-logger image
+```
+
+This uses `docker buildx` to create a [multi-platform image][]. To set up your build host system to be able to build these images, see [this guide][qemu-binfmt].
+
+[multi-platform image]: https://docs.docker.com/build/building/multi-platform/
+[qemu-binfmt]: https://docs.nvidia.com/datacenter/cloud-native/playground/x-arch.html
 
 ### Testing