anchor.diff:  
   # For image resizing/manipulation.
   RUN apt-get update && \
  -  apt-get -y install libvips && \
  +  apt-get -y install file libvips && \
     rm -rf /var/lib/apt/lists/*
   
   # For image optimization.
  
positive.code: ARG POSTGRESQL_VERSION=14
  RUN set -x && \
    apt-get update && \
    apt-get -y install libvips && \
    apt-get -y install jpegoptim optipng gifsicle pngquant && \
    apt-get -y install "postgresql-client-${POSTGRESQL_VERSION}" && \
    pg_dump --version | grep --fixed-strings "(PostgreSQL) ${POSTGRESQL_VERSION}." && \
  
negative.code:   PORT=3000 \
    DEV_CACHE_DIR=/dev-cache
  
  # Build dependencies
  RUN apt-get update && \
    apt-get -y install build-essential curl gpg lsb-release && \
    rm -rf /var/lib/apt/lists/*
  