anchor.diff:      && wget -O /usr/local/bin/tini "https://github.com/krallin/tini/releases/download/v$TINI_VERSION/tini" \
       && wget -O /usr/local/bin/tini.asc "https://github.com/krallin/tini/releases/download/v$TINI_VERSION/tini.asc" \
       && export GNUPGHOME="$(mktemp -d)" \
  -    && gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys 595E85A6B1B4779EA4DAAEC70B588DFF0527A9B7 \
  +    && for key in \
  +      595E85A6B1B4779EA4DAAEC70B588DFF0527A9B7 \
  +    ; do \
  +      gpg --batch --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys "$key" || \
  +      gpg --batch --keyserver hkp://ipv4.pool.sks-keyservers.net --recv-keys "$key" || \
  +      gpg --batch --keyserver hkp://pgp.mit.edu:80 --recv-keys "$key" ; \
  +    done \
       && gpg --batch --verify /usr/local/bin/tini.asc /usr/local/bin/tini \
       && rm -r "$GNUPGHOME" /usr/local/bin/tini.asc \
       && chmod +x /usr/local/bin/tini \
  
positive.code: 
  RUN [ "$SENTRY_BUILD" != '' ] \
      # Install node to build assets
      && export NODE_VERSION=8.9.1 \
      && export YARN_VERSION=1.3.2 \
      && export GNUPGHOME="$(mktemp -d)" \
      && export NPM_CONFIG_CACHE="$(mktemp -d)" \
      && export YARN_CACHE_FOLDER="$(mktemp -d)" \
      # gpg keys listed at https://github.com/nodejs/node
      && for key in \
        94AE36675C464D64BAFA68DD7434390BDBE9B9C5 \
        B9AE9905FFD7803F25714661B63B535A4C206CA9 \
        77984A986EBC2AA786BC0F66B01FBB92821C587A \
        56730D5401028683275BD23C23EFEFE93C4CFFFE \
        71DCFD284A79C3B38668286BC97EC7A07EDE3FC1 \
        FD3A5288F042B6850C66B31F09FE44734EB7990E \
        C4F0DFFF4E8C1A8236409D08E73BC641CC11F4C8 \
        DD8F2338BAE7501E3DD5AC78C273792F7D83545D \
      ; do \
        gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
      done \
      && mkdir -p /usr/local/node && PATH=/usr/local/node/bin:$PATH \
      && apt-get update && apt-get install -y --no-install-recommends make g++ wget \
  
negative.code:         gcc \
          git \
          libffi-dev \
          libgeoip-dev \
          libjpeg-dev \
          libpq-dev \
          libxml2-dev \
  