Update alpine.yml

Author: dogi

.github/workflows/alpine.yml

@@ -43,10 +43,10 @@ jobs:
             arm64) : "arm64v8/alpine:${{ matrix.version }}" ;;
           esac
           base="$_"
-          docker pull -q $base &>/dev/null
-          docker pull -q $repo &>/dev/null
-          basesha=$(docker image inspect $base | jq --raw-output '.[0].RootFS.Layers|.[]')
-          reposha=$(docker image inspect $repo | jq --raw-output '.[0].RootFS.Layers|.[]')
+          docker pull -q --platform=linux/${{ matrix.version }} $base &>/dev/null
+          docker pull -q --platform=linux/${{ matrix.version }} $repo &>/dev/null
+          basesha=$(docker image inspect --platform=linux/${{ matrix.version }} $base | jq --raw-output '.[0].RootFS.Layers|.[]')
+          reposha=$(docker image inspect --platform=linux/${{ matrix.version }} $repo | jq --raw-output '.[0].RootFS.Layers|.[]')
           echo "base sha:$basesha repo sha:$reposha"
           ${{ github.event.inputs.buildtype  == 'force' }} && echo "images=true" >> $GITHUB_OUTPUT || echo "no force" 
           [[ $reposha == *$basesha* ]] && echo "no changes" || echo "images=true" >> $GITHUB_OUTPUT