Use build-arg to make FROM image a variable
Change-Id: Id48ab2ec34e77e413c6a9ef1ade4585b703d59a9
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FROM centos:7
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ARG FROM=centos:7
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FROM ${FROM}
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ENV PATH=/var/lib/openstack/bin:$PATH
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ENV PROJECT=heat
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FROM debian:jessie-slim
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ARG FROM=debian:jessie-slim
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FROM ${FROM}
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ENV PATH=/var/lib/openstack/bin:$PATH
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ENV PROJECT=heat
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FROM ubuntu:xenial
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ARG FROM=ubuntu:xenial
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FROM ${FROM}
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ENV PATH=/var/lib/openstack/bin:$PATH
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ENV PROJECT=heat
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