Add multi-arch image build

Author: Sunser

.github/workflows/docker-image.yml

@@ -54,7 +54,7 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           context: .
-          platforms: linux/amd64
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -1,16 +1,33 @@
-FROM golang:1.22-alpine AS builder
+ARG BUILDPLATFORM=linux/amd64
+FROM --platform=$BUILDPLATFORM golang:1.22-alpine AS builder
+
+ARG TARGETOS
+ARG TARGETARCH
+ARG TARGETVARIANT
 
 WORKDIR /src
+RUN apk add --no-cache ca-certificates tzdata
+
 COPY go.mod ./
 COPY cmd ./cmd
 COPY internal ./internal
 
-RUN mkdir -p /out && CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -trimpath -ldflags="-s -w" -o /out/ecs-controller ./cmd/ecs-controller
+RUN set -eux; \
+    target_os="${TARGETOS:-linux}"; \
+    target_arch="${TARGETARCH:-amd64}"; \
+    if [ "$target_arch" = "arm" ]; then \
+      export GOARM="${TARGETVARIANT#v}"; \
+      if [ -z "$GOARM" ]; then export GOARM=7; fi; \
+    fi; \
+    mkdir -p /out; \
+    CGO_ENABLED=0 GOOS="$target_os" GOARCH="$target_arch" \
+      go build -trimpath -ldflags="-s -w" -o /out/ecs-controller ./cmd/ecs-controller
 
 FROM alpine:3.20
 
-RUN apk add --no-cache ca-certificates tzdata
 WORKDIR /app
+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 /out/ecs-controller ./ecs-controller
 COPY web ./web
 

README.md

@@ -565,6 +565,26 @@ go build -o ecs-controller ./cmd/ecs-controller
 ghcr.io/sunser/ecs-controller
 ```
 
+镜像使用 Docker Buildx 构建，当前发布以下架构：
+
+| 平台 | 常见设备 |
+| --- | --- |
+| `linux/amd64` | 常见 x86_64 云服务器、PC、NAS |
+| `linux/arm64` | ARM64 云服务器、Apple Silicon、部分 NAS 和开发板 |
+| `linux/arm/v7` | 32 位 ARMv7 设备 |
+
+使用同一个镜像 tag 即可，Docker 会按当前机器架构自动选择对应镜像。例如：
+
+```bash
+docker pull ghcr.io/sunser/ecs-controller:latest
+```
+
+如果需要在本地手工构建多架构镜像，可以使用：
+
+```bash
+docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 -t ghcr.io/sunser/ecs-controller:local .
+```
+
 推送到 `main` 分支后会生成：
 
 ```text