fix: build only one aarch

Author: eksrha

.github/workflows/build-image.yaml

@@ -1,5 +1,8 @@
 name: Build docker Image
 
+env:
+  IMAGE_PLATFORMS: linux/386,linux/amd64,linux/arm64,linux/arm/v7,linux/ppc64le
+
 on:
   workflow_dispatch:
   push:
@@ -26,10 +29,6 @@ jobs:
           echo "::set-output name=tag::$(git describe --abbrev=0)"
  
   build-image:
-    strategy:
-      matrix:
-        platforms: [linux/386,linux/amd64,linux/arm64,linux/arm/v7,linux/ppc64le]
-
     runs-on: ubuntu-latest
     needs: generate_tag
     steps:
@@ -46,7 +45,7 @@ jobs:
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
         with:
-          platforms: ${{ matrix.platforms }}
+          platforms: ${{ env.IMAGE_PLATFORMS }}
       - name: Set up Docker Buildx
         id: buildx
         uses: docker/setup-buildx-action@v1
@@ -56,7 +55,7 @@ jobs:
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: ./docker-image/
-          platforms: ${{ matrix.platforms }}
+          platforms: ${{ env.IMAGE_PLATFORMS }}
           push: true
           tags: |
             ghcr.io/${{ github.repository }}:latest