feat: Build multi-arch image via goreleaser

* push to ghcr

.github/workflows/goreleaser.yml

@@ -7,22 +7,47 @@ jobs:
   goreleaser:
     runs-on: ubuntu-latest
     steps:
-      - name: checkout
-        uses: actions/checkout@v2
-      - name: unshallow
-        run: git fetch --prune --unshallow
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: set lower case names
+        run: |
+          echo "GITHUB_ACTOR_LC=${ACTOR,,}" >>${GITHUB_ENV}
+          echo "GITHUB_REPO_NAME_LC=${REPO,,}" >>${GITHUB_ENV}
+        env:
+          ACTOR: ${{ github.actor }}
+          REPO: ${{ github.repository }}
+
       - name: setup-go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v3
         with:
           go-version: 1.18
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ env.GITHUB_ACTOR_LC }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+
       - name: capture current date
         id: date
         run: echo "::set-output name=date::$(date -u '+%Y-%m-%d-%H:%M:%S-%Z')"
       - name: goreleaser
-        uses: goreleaser/goreleaser-action@v2
+        uses: goreleaser/goreleaser-action@v3
         with:
           version: latest
           args: release --rm-dist
         env:
+          DOCKER_REPO: ghcr.io/${{ env.GITHUB_REPO_NAME_LC }}
           DATE: ${{ steps.date.outputs.date }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.goreleaser.yml

@@ -2,29 +2,57 @@ before:
   hooks:
     - go mod download
 env:
-- CGO_ENABLED=0
-- GOPROXY=https://proxy.golang.org
+  - CGO_ENABLED=0
+  - GOPROXY=https://proxy.golang.org
 project_name: athens
+
 builds:
-- id: builds
-  goos:
-    - linux
-    - darwin
-  goarch:
-    - amd64
-    - x86_64
-  main: cmd/proxy/main.go
-  binary: athens
-  ldflags:
-    - -X "github.com/gomods/athens/pkg/build.version={{ .Tag }}"
-    - -X "github.com/gomods/athens/pkg/build.buildDate={{ .Env.DATE }}"
+  - id: builds
+    goos:
+      - linux
+      - darwin
+    goarch:
+      - amd64
+      - arm64
+
+    main: cmd/proxy/main.go
+    binary: athens
+    ldflags:
+      - -X "github.com/gomods/athens/pkg/build.version={{ .Tag }}"
+      - -X "github.com/gomods/athens/pkg/build.buildDate={{ .Env.DATE }}"
+
+dockers:
+  - image_templates:
+      - "{{ .Env.DOCKER_REPO }}:{{ .Version }}-amd64"
+    use: buildx
+    dockerfile: goreleaser.dockerfile
+    build_flag_templates:
+      - "--platform=linux/amd64"
+    extra_files:
+      - config.dev.toml
+  - image_templates:
+      - "{{ .Env.DOCKER_REPO }}:{{ .Version }}-arm64"
+    use: buildx
+    goarch: arm64
+    dockerfile: goreleaser.dockerfile
+    build_flag_templates:
+      - "--platform=linux/arm64"
+    extra_files:
+      - config.dev.toml
+
+docker_manifests:
+  - name_template: "{{ .Env.DOCKER_REPO }}:{{ .Version }}"
+    image_templates:
+      - "{{ .Env.DOCKER_REPO }}:{{ .Version }}-amd64"
+      - "{{ .Env.DOCKER_REPO }}:{{ .Version }}-arm64"
+
 checksum:
-  name_template: 'checksums.txt'
+  name_template: "checksums.txt"
 snapshot:
   name_template: "{{ .Tag }}-next"
 changelog:
   sort: asc
   filters:
     exclude:
-    - '^docs:'
-    - '^test:'
+      - "^docs:"
+      - "^test:"

goreleaser.dockerfile

@@ -0,0 +1,24 @@
+# Use by goreleaser
+ARG GOLANG_VERSION=1.18
+ARG ALPINE_VERSION=3.15
+
+FROM golang:${GOLANG_VERSION}-alpine AS builder
+
+FROM alpine:${ALPINE_VERSION}
+
+ENV GO111MODULE=on
+COPY --from=builder /usr/local/go/bin/go /bin/go
+
+COPY athens /bin/athens-proxy
+COPY config.dev.toml /config/config.toml
+
+RUN apk add --no-cache --update git git-lfs mercurial openssh-client subversion procps fossil tini && \
+		mkdir -p /usr/local/go && \
+		chmod 644 /config/config.toml
+
+# Add tini, see https://github.com/gomods/athens/issues/1155 for details.
+EXPOSE 3000
+
+ENTRYPOINT [ "/sbin/tini", "--" ]
+
+CMD ["athens-proxy", "-config_file=/config/config.toml"]