chore(build-docker-image): add linux/riscv64 platform

Author: marjune163

build/build-docker-image.sh

@@ -12,7 +12,7 @@ docker buildx build \
 	-t "$TAG_PREFIX:latest" \
 	-t "$TAG_PREFIX:$VERSION" \
 	-f ./build-docker-image-dockerfile \
-	--platform linux/amd64,linux/386,linux/arm64,linux/arm/v7 \
+	--platform linux/amd64,linux/386,linux/arm64,linux/arm/v7,linux/riscv64 \
 	--push \
 	--build-arg GOOS=linux \
 	--build-arg GOARCH=amd64 \