title: The command returned a non-zero code: 2 docker
body: <p>The following is the Dockerfile,</p>
  
  <pre><code>FROM alpine:3.10
  
  # Add the testing repo in case it's needed for additional dependencies
  # For example, gdal can be installed by using gdal@community
  RUN echo "@community http://dl-cdn.alpinelinux.org/alpine/edge/community" &gt;&gt; /etc/apk/repositories
  
  # Install system dependencies
  RUN apk add --no-cache --update \
    bash \
    gcc \
    build-base \
    musl-dev \
    postgresql-dev \
    'python3~=3.7.5' \
    'python3-dev~=3.7.5' \
    curl \
  # zlib, zlib-dev, and libjpeg-turbo are required by pillow
    zlib \
    zlib-dev \
    libjpeg-turbo \
    libjpeg-turbo-dev \
    libffi-dev
  RUN pip3 install --no-cache-dir -q pipenv
  
  # Add our code
  ADD ./ /opt/webapp/
  WORKDIR /opt/webapp
  
  # Install dependencies
  RUN pipenv install --deploy --system
  
  # Allow SECRET_KEY to be passed via arg so collectstatic can run during build time
  ARG SECRET_KEY
  RUN python3 manage.py collectstatic --no-input
  
  # Run the image as a non-root user
  RUN adduser -D myuser
  USER myuser
  
  # Run the web server on port $PORT
  CMD waitress-serve --port=$PORT performit_15391.wsgi:application
  </code></pre>
  
  <p>The following is the LOG from the server that is recorded, I don't know why the build is failing, can anybody guide please?</p>
  
  <pre><code>=== Fetching app code.
  
  === Building release (./backend/Dockerfile)
  Sending build context to Docker daemon    895kB
  
  Step 1/12 : FROM alpine:3.10
  3.10: Pulling from library/alpine
  21c83c524219: Pulling fs layer
  21c83c524219: Verifying Checksum
  21c83c524219: Download complete
  21c83c524219: Pull complete
  Digest: sha256:f0e9534a598e501320957059cb2a23774b4d4072e37c7b2cf7e95b241f019e35
  Status: Downloaded newer image for alpine:3.10
   ---&gt; be4e4bea2c2e
  Step 2/12 : RUN echo "@community http://dl-cdn.alpinelinux.org/alpine/edge/community" &gt;&gt; /etc/apk/repositories
   ---&gt; Running in 42057b30f8bf
  Removing intermediate container 42057b30f8bf
   ---&gt; 015ada914599
  Step 3/12 : RUN apk add --no-cache --update   bash   gcc   build-base   musl-dev   postgresql-dev   'python3~=3.7.5'   'python3-dev~=3.7.5'   curl   zlib   zlib-dev   libjpeg-turbo   libjpeg-turbo-dev   libffi-dev
   ---&gt; Running in acf5e541c616
  fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/main/x86_64/APKINDEX.tar.gz
  fetch http://dl-cdn.alpinelinux.org/alpine/v3.10/community/x86_64/APKINDEX.tar.gz
  fetch http://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz
  [91mERROR: unsatisfiable constraints:
  [0m  python3-3.7.7-r0:
      breaks: world[python3~3.7.5]
      satisfies: python3-dev-3.7.7-r0[python3=3.7.7-r0]
    python3-dev-3.7.7-r0:
      breaks: world[python3-dev~3.7.5]
  The command '/bin/sh -c apk add --no-cache --update   bash   gcc   build-base   musl-dev   postgresql-dev   'python3~=3.7.5'   'python3-dev~=3.7.5'   curl   zlib   zlib-dev   libjpeg-turbo   libjpeg-turbo-dev   libffi-dev' returned a non-zero code: 2
  </code></pre>
  
  <p>This above is the log, the apk command is failing. Is there any dependency issue? for me the log message isn't very much useful. Thanks in advance.</p>