Backport(v1.16) github: Use arm host when checking build (fluent#1557)

Signed-off-by: Kentaro Hayashi <[email protected]>

Author: kenhys

templates/Dockerfile.erb

@@ -7,14 +7,7 @@
 
 <% if is_arm64 %>
 # For multiarch build on Docker hub automated build.
-FROM golang:alpine AS builder
-WORKDIR /go
-ENV QEMU_DOWNLOAD_SHA256 5db25cccb40ac7b1ca857653b883376b931d91b06ff34ffe70dcf6180bd07bb8
-RUN apk add curl --no-cache
-RUN curl -sL -o qemu-6.0.0.balena1-aarch64.tar.gz https://github.com/balena-io/qemu/releases/download/v6.0.0%2Bbalena1/qemu-6.0.0.balena1-aarch64.tar.gz && echo "$QEMU_DOWNLOAD_SHA256 *qemu-6.0.0.balena1-aarch64.tar.gz" | sha256sum -c - | tar zxvf qemu-6.0.0.balena1-aarch64.tar.gz -C . && mv qemu-6.0.0+balena1-aarch64/qemu-aarch64-static .
-
 FROM fluent/fluentd:<%= fluentd_ver %>-debian-arm64-1.0
-COPY --from=builder /go/qemu-aarch64-static /usr/bin/
 <% else %>
 FROM fluent/fluentd:<%= fluentd_ver %>-debian-amd64-1.0
 <% end %>