/bin/bash: 1: ./punto de entrada.sh: no encontrado

En Debian GNU/Linux 11 (bullseye) basado en Dockerfile, traté de usar CMD para ejecutar un comando de punto de entrada:

#EDIT

WORKDIR "/tmp"

USER root

COPY ./entrypoint.sh /tmp/rails/entrypoint.sh
RUN chmod +x /tmp/rails/entrypoint.sh
EXPOSE 80
CMD ["/bin/bash","-c","/tmp/rails/entrypoint.sh"]

/tmp/rails/punto de entrada.sh:

#!/bin/bash
nginx -g 'daemon off;'
cd /tmp
RAILS_ENV=proudction bundle exec rails server -p 3000
service nginx start

pero sigo recibiendo error

/bin/bash: 1: ./entrypoint.sh: not found

yo también probé

ENTRYPOINT /tmp/rails/entrypoint.sh

CMD ["/bin/bash","-c","/tmp/rails/entrypoint.sh"]

pero siempre muestra entrypoint.sh no encontrado, ¿alguna idea?

EDITAR

archivo docker completo:

FROM ruby:3.0.5

RUN apt update -y
RUN apt install -y nginx
COPY --from=public.ecr.aws/awsguru/aws-lambda-adapter:0.6.1 /lambda-adapter /opt/extensions/lambda-adapter

RUN apt-get update -y
RUN apt-get --assume-yes install autoconf bison patch build-essential rustc libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libgmp-dev libncurses5-dev libffi-dev libgdbm6 libgdbm-dev libdb-dev uuid-dev



RUN apt-get install -y rubygems #ruby-dev
RUN gem install bundler -v '2.2.32'
RUN bundle config --local build.sassc --disable-march-tune-native

# UPDATE NODE:
RUN curl -sL https://deb.nodesource.com/setup_12.x |  bash -
RUN apt-get install -y nodejs
# YARN:
RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
RUN apt update && apt install yarn
# Fix issue with sassc gem
RUN bundle config --local build.sassc --disable-march-tune-native
RUN apt-get install -y awscli
#END OF ORIGINAL

#RUN bundle config set without 'development test'

#RUN rm -rf /home/app/webapp/app
RUN mkdir /tmp/rails
COPY . /tmp/rails
WORKDIR "/tmp/rails"



RUN bundle install # --path=vendor
ENV RAILS_SERVE_STATIC_FILES false

ENV EXECJS_RUNTIME=Disabled
ENV WEBPACKER_PRECOMPILE=false
ENV NODE_ENV=production

RUN yarn config set ignore-engines true
#RUN bundle exec rails webpacker:compile
RUN bundle exec rails assets:precompile

ARG GIT_REVISION_ARG
ENV GIT_REVISION=$GIT_REVISION_ARG

#Rails App
RUN rm -f /etc/service/nginx/down
RUN rm -f /etc/nginx/sites-enabled/default
ADD webapp.conf /etc/nginx/sites-enabled/webapp.conf

RUN chmod +x /tmp/rails/entrypoint.sh

WORKDIR "/tmp"

ADD nginx/app/config/ /etc/nginx/
ADD nginx/app/images/ /usr/share/nginx/html/images
USER root

COPY ./entrypoint.sh /tmp/rails/entrypoint.sh
RUN chmod +x /tmp/rails/entrypoint.sh

ENTRYPOINT /tmp/rails/entrypoint.sh
EXPOSE 80

CMD ["/bin/bash","-c","/tmp/rails/entrypoint.sh"]