Build multi-platform docker image (#28)

Author: mokiat

.github/workflows/master.yml

@@ -47,9 +47,10 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Build and push
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v5
         with:
           context: .
           file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64,linux/i386
           push: true
           tags: mokiat/gocrane:latest

.github/workflows/release.yml

@@ -2,7 +2,7 @@ name: Release
 
 on:
   push:
-    tags: [ '*' ]
+    tags: ["*"]
 
 jobs:
   push:
@@ -29,9 +29,10 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Build and push
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v5
         with:
           context: .
           file: ./Dockerfile
+          platforms: linux/amd64,linux/arm64,linux/i386
           push: true
           tags: mokiat/gocrane:${{ steps.get_tag.outputs.TAG }}