Cannot build multi-platform image

[igoberman]

Hi I followed your instructions to build a custom docker image based on https://github.com/fluent/fluentd-docker-image

My docker file is below
`FROM fluent/fluentd:v1.16.2-1.1
MAINTAINER YOUR_NAME <...@...>

USER root

RUN apk add --no-cache --update --virtual .build-deps
sudo build-base ruby-dev
&& sudo gem install fluent-plugin-cloudwatch-logs
&& sudo gem sources --clear-all
&& apk del .build-deps
&& rm -rf /home/fluent/.gem/ruby/2.5.0/cache/*.gem

COPY fluent.conf /fluentd/etc/
COPY entrypoint.sh /bin/

USER fluent`

I then run buildx command below to create multi platform image for amd64 and arm64 linux.

docker buildx build --push --builder=container --platform=linux/amd64,linux/arm64 -t barchart/barchart-fluentd:3.0 ./

However, I am getting this error. I am doing the build on Mac. Do you know what I am doing wrong?
Thanks

#0 12.88 OK: 270 MiB in 54 packages #0 15.13 ERROR: While executing gem ... (Gem::FilePermissionError) #0 15.13 You don't have write permissions for the /usr/lib/ruby/gems/3.1.0 directory. #0 15.13 /usr/lib/ruby/3.1.0/rubygems/installer.rb:712:in verify_gem_home'
#0 15.13 /usr/lib/ruby/3.1.0/rubygems/installer.rb:902:in pre_install_checks' #0 15.13 /usr/lib/ruby/3.1.0/rubygems/installer.rb:302:in install'
#0 15.13 /usr/lib/ruby/3.1.0/rubygems/resolver/specification.rb:104:in install' #0 15.13 /usr/lib/ruby/3.1.0/rubygems/request_set.rb:194:in block in install'
#0 15.13 /usr/lib/ruby/3.1.0/rubygems/request_set.rb:182:in each' #0 15.13 /usr/lib/ruby/3.1.0/rubygems/request_set.rb:182:in install'
#0 15.13 /usr/lib/ruby/3.1.0/rubygems/commands/install_command.rb:210:in install_gem' #0 15.13 /usr/lib/ruby/3.1.0/rubygems/commands/install_command.rb:226:in block in install_gems'
#0 15.13 /usr/lib/ruby/3.1.0/rubygems/commands/install_command.rb:219:in each' #0 15.13 /usr/lib/ruby/3.1.0/rubygems/commands/install_command.rb:219:in install_gems'
#0 15.13 /usr/lib/ruby/3.1.0/rubygems/commands/install_command.rb:167:in execute' #0 15.13 /usr/lib/ruby/3.1.0/rubygems/command.rb:323:in invoke_with_build_args'
#0 15.13 /usr/lib/ruby/3.1.0/rubygems/command_manager.rb:185:in process_args' #0 15.13 /usr/lib/ruby/3.1.0/rubygems/command_manager.rb:149:in run'
#0 15.13 /usr/lib/ruby/3.1.0/rubygems/gem_runner.rb:51:in run' #0 15.13 /usr/bin/gem:21:in '

ERROR: failed to solve: executor failed running [/bin/sh -c apk add --no-cache --update --virtual .build-deps sudo build-base ruby-dev && sudo gem install fluent-plugin-cloudwatch-logs && sudo gem sources --clear-all && apk del .build-deps && rm -rf /home/fluent/.gem/ruby/2.5.0/cache/*.gem]: buildkit-runc did not terminate successfully
`