content: FROM busybox:latest
  ENV  DUMMY=1
  
  ARG BUILDPLATFORM
  ARG BUILDOS
  ARG BUILDARCH
  ARG BUILDVARIANT
  ARG TARGETPLATFORM
  ARG TARGETOS
  ARG TARGETARCH
  ARG TARGETVARIAN
  
  ARG BUILD_CACHE_KEY
  ARG BUILD_CACHE_PATH
  ARG BUILD_CONTEXT
  ARG BUILD_DATE
  ARG BUILD_DESC
  ARG BUILD_DOCKERFILE
  ARG BUILD_DOCKERFILE_SQUASHED
  ARG BUILD_NAME
  ARG BUILD_TMP_NAME
  ARG BUILD_PLATFORM
  ARG BUILD_README
  ARG BUILD_REVISION
  ARG BUILD_SOURCE_IMAGE
  ARG BUILD_TAG
  ARG BUILD_TAGS
  ARG LATEST_PHP
  ARG LATEST_S6
  ARG OS_BASE
  ARG OS_VERSION
  ARG PHP_VERSION
  ARG PHP_VARIANT
  ARG S6_PATH
  ARG S6_VERSION
  ARG SQUASH_CMD
  
  ENV BUILDPLATFORM=$BUILDPLATFORM
  ENV BUILDOS=$BUILDOS
  ENV BUILDARCH=$BUILDARCH
  ENV BUILDVARIANT=$BUILDVARIANT
  ENV TARGETPLATFORM=$TARGETPLATFORM
  ENV TARGETOS=$TARGETOS
  ENV TARGETARCH=$TARGETARCH
  ENV TARGETVARIAN=$TARGETVARIAN
  
  ENV BUILD_CACHE_KEY=$BUILD_CACHE_KEY
  ENV BUILD_CACHE_PATH=$BUILD_CACHE_PATH
  ENV BUILD_CONTEXT=$BUILD_CONTEXT
  ENV BUILD_DATE=$BUILD_DATE
  ENV BUILD_DESC=$BUILD_DESC
  ENV BUILD_DOCKERFILE=$BUILD_DOCKERFILE
  ENV BUILD_DOCKERFILE_SQUASHED=$BUILD_DOCKERFILE_SQUASHED
  ENV BUILD_NAME=$BUILD_NAME
  ENV BUILD_TMP_NAME=$BUILD_TMP_NAME
  ENV BUILD_PLATFORM=$BUILD_PLATFORM
  ENV BUILD_README=$BUILD_README
  ENV BUILD_REVISION=$BUILD_REVISION
  ENV BUILD_SOURCE_IMAGE=$BUILD_SOURCE_IMAGE
  ENV BUILD_TAG=$BUILD_TAG
  ENV BUILD_TAGS=$BUILD_TAGS
  ENV LATEST_PHP=$LATEST_PHP
  ENV LATEST_S6=$LATEST_S6
  ENV OS_BASE=$OS_BASE
  ENV OS_VERSION=$OS_VERSION
  ENV PHP_VERSION=${PHP_VERSION//-rc/}
  ENV PHP_VARIANT=$PHP_VARIANT
  ENV S6_PATH=$S6_PATH
  ENV S6_VERSION=$S6_VERSION
  ENV SQUASH_CMD=$SQUASH_CMD
  
  RUN <<'EOF'
  echo BUILDPLATFORM=$BUILDPLATFORM
  echo BUILDOS=$BUILDOS
  echo BUILDARCH=$BUILDARCH
  echo BUILDVARIANT=$BUILDVARIANT
  echo TARGETPLATFORM=$TARGETPLATFORM
  echo TARGETOS=$TARGETOS
  echo TARGETARCH=$TARGETARCH
  echo TARGETVARIAN=$TARGETVARIAN
  
  echo BUILD_CACHE_KEY=$BUILD_CACHE_KEY
  echo BUILD_CACHE_PATH=$BUILD_CACHE_PATH
  echo BUILD_CONTEXT=$BUILD_CONTEXT
  echo BUILD_DATE=$BUILD_DATE
  echo BUILD_DESC=$BUILD_DESC
  echo BUILD_DOCKERFILE=$BUILD_DOCKERFILE
  echo BUILD_DOCKERFILE_SQUASHED=$BUILD_DOCKERFILE_SQUASHED
  echo BUILD_NAME=$BUILD_NAME
  echo BUILD_TMP_NAME=$BUILD_TMP_NAME
  echo BUILD_PLATFORM=$BUILD_PLATFORM
  echo BUILD_README=$BUILD_README
  echo BUILD_REVISION=$BUILD_REVISION
  echo BUILD_SOURCE_IMAGE=$BUILD_SOURCE_IMAGE
  echo BUILD_TAG=$BUILD_TAG
  echo BUILD_TAGS=$BUILD_TAGS
  echo LATEST_PHP=$LATEST_PHP
  echo LATEST_S6=$LATEST_S6
  echo OS_BASE=$OS_BASE
  echo OS_VERSION=$OS_VERSION
  echo PHP_VERSION=$PHP_VERSION
  echo PHP_VARIANT=$PHP_VARIANT
  echo S6_PATH=$S6_PATH
  echo S6_VERSION=$S6_VERSION
  echo SQUASH_CMD=$SQUASH_CMD
  EOF
  