Add support for linux/s390x (#3189)

Signed-off-by: Yan Song Liu <lysliu@cn.ibm.com>

.github/workflows/artifacts.yaml

@@ -117,7 +117,7 @@ jobs:
         uses: docker/build-push-action@4a13e500e55cf31b7a5d59a38ab2040ab0f42f56 # v5.1.0
         with:
           context: .
-          platforms: linux/amd64,linux/arm/v7,linux/arm64,linux/ppc64le
+          platforms: linux/amd64,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x
           tags: ${{ steps.meta.outputs.tags }}
           build-args: |
             BASE_IMAGE=${{ matrix.variant }}