From 18f4b42cf121dd9a5f9f9850292bba35d5eccdfe Mon Sep 17 00:00:00 2001
From: Andrea Spacca <andrea.spacca@gmail.com>
Date: Sun, 14 Jun 2020 19:53:36 +0200
Subject: [PATCH] ISSUE-313-BUILDX

---
 .github/workflow/buildx.yml | 67 +++++++++++++++++++++++++++++++++++++
 Dockerfile                  |  8 ++++-
 2 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 .github/workflow/buildx.yml

diff --git a/.github/workflow/buildx.yml b/.github/workflow/buildx.yml
new file mode 100644
index 0000000..8941515
--- /dev/null
+++ b/.github/workflow/buildx.yml
@@ -0,0 +1,67 @@
+# ref: https://github.com/crazy-max/diun/blob/master/.github/workflows/build.yml
+
+name: Docker
+on: [push]
+jobs:
+  build:
+    runs-on: ubuntu-18.04
+    steps:
+      - name: Prepare
+        id: prepare
+        run: |
+          if [[ $GITHUB_REF == refs/tags/* ]]; then
+            echo ::set-output name=version::${GITHUB_REF#refs/tags/v}
+          elif [[ $GITHUB_REF == refs/heads/master ]]; then
+            echo ::set-output name=version::latest
+          elif [[ $GITHUB_REF == refs/heads/* ]]; then
+            echo ::set-output name=version::${GITHUB_REF#refs/heads/}
+          else
+            echo ::set-output name=version::snapshot
+          fi
+          echo ::set-output name=docker_platforms::linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64/v8,linux/386
+          echo ::set-output name=docker_image::${{ secrets.DOCKER_USERNAME }}/${{ github.event.repository.name }}
+        # https://github.com/crazy-max/ghaction-docker-buildx
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: crazy-max/ghaction-docker-buildx@v1
+        with:
+          version: latest
+
+      - name: Environment
+        run: |
+          echo home=$HOME
+          echo git_ref=$GITHUB_REF
+          echo git_sha=$GITHUB_SHA
+          echo version=${{ steps.prepare.outputs.version }}
+          echo image=${{ steps.prepare.outputs.docker_image }}
+          echo platforms=${{ steps.prepare.outputs.docker_platforms }}
+          echo avail_platforms=${{ steps.buildx.outputs.platforms }}
+        # https://github.com/actions/checkout
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Docker Buildx (no push)
+        run: |
+          docker buildx bake \
+            --set ${{ github.event.repository.name }}.platform=${{ steps.prepare.outputs.docker_platforms }} \
+            --set ${{ github.event.repository.name }}.output=type=image,push=false \
+            --set ${{ github.event.repository.name }}.tags="${{ steps.prepare.outputs.docker_image }}:${{ steps.prepare.outputs.version }}" \
+            --file Dockerfile
+      - name: Docker Login
+        if: success()
+        env:
+          DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
+        run: |
+          echo "${DOCKER_PASSWORD}" | docker login --username "${{ secrets.DOCKER_USERNAME }}" --password-stdin
+      - name: Docker Buildx (push)
+        if: success()
+        run: |
+          docker buildx bake \
+            --set ${{ github.event.repository.name }}.platform=${{ steps.prepare.outputs.docker_platforms }} \
+            --set ${{ github.event.repository.name }}.output=type=image,push=true \
+            --set ${{ github.event.repository.name }}.tags="${{ steps.prepare.outputs.docker_image }}:${{ steps.prepare.outputs.version }}" \
+            --file docker-compose.yaml
+      - name: Clear
+        if: always()
+        run: |
+          rm -f ${HOME}/.docker/config.json
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index 0018ba1..6ba642c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,12 @@
 # Default to Go 1.13
 ARG GO_VERSION=1.13
-FROM golang:${GO_VERSION}-alpine as build
+FROM --platform=$BUILDPLATFORM golang:${GO_VERSION}-alpine as build
+
+# Convert TARGETPLATFORM to GOARCH format
+# https://github.com/tonistiigi/xx
+COPY --from=tonistiigi/xx:golang / /
+
+ARG TARGETPLATFORM
 
 # Necessary to run 'go get' and to compile the linked binary
 RUN apk add git musl-dev