Use ADD and git-url fragment to clone qemu repo, use master as defaul… #200
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This PR moves the clone of qemu/qemu from a
RUN
to anADD
targeting a url with a fragment targeting a specific git ref which does a shallow clone resultig in a quicker build time.The migration of
QEMU_VERSION
's default value fromHEAD
tomaster
is to ensure the fragement has a valid ref.