[SOLVED] "/bin/sh: hugo: not found" in Docker container

This is the Docker file which I use.

https://hub.docker.com/r/joergklein/hugo

FROM debian:stable

# Install pygments (for syntax highlighting) 
RUN apt-get -qq update \
	&& DEBIAN_FRONTEND=noninteractive apt-get -qq install -y --no-install-recommends python-pygments git ca-certificates asciidoc curl \
	&& rm -rf /var/lib/apt/lists/*

# Download and install hugo
ENV HUGO_VERSION 0.44
ENV HUGO_BINARY hugo_${HUGO_VERSION}_Linux-64bit.deb

#ADD https://github.com/spf13/hugo/releases/download/v${HUGO_VERSION}/${HUGO_BINARY} /tmp/hugo.deb
RUN curl -sL -o /tmp/hugo.deb \
    https://github.com/spf13/hugo/releases/download/v${HUGO_VERSION}/${HUGO_BINARY} && \
    dpkg -i /tmp/hugo.deb && \
    rm /tmp/hugo.deb && \
    mkdir /usr/share/blog

WORKDIR /usr/share/blog

# Expose default hugo port
EXPOSE 1313

# Automatically build site
ONBUILD ADD site/ /usr/share/blog
ONBUILD RUN hugo -d /usr/share/nginx/html/

# By default, serve site
ENV HUGO_BASE_URL http://localhost:1313
CMD hugo server -b ${HUGO_BASE_URL} --bind=0.0.0.0

my .gitlab-ci.yml

image: joergklein/hugo:latest

before_script:
  - apt-get update
  - apt-get --yes --force-yes install git ssh rsync
  - git submodule update --init --recursive

stages:
    - test
    - deploy

test:
  stage: test
  script:
  - hugo
  except:
  - master

deploy:
  stage: deploy
  script:
    - hugo
    - mkdir "${HOME}/.ssh"
    - echo "${SSH_HOST_KEY}" > "${HOME}/.ssh/known_hosts"
    - echo "${SSH_PRIVATE_KEY}" > "${HOME}/.ssh/id_rsa"
    - chmod 700 "${HOME}/.ssh/id_rsa"
    - rsync -hrvz --delete --exclude=_ public/ user@example.com:www/developer/

  artifacts:
    paths:
    - public
  only:
  - master