Add marker file via Dockerfile. Script will remove marker and exit if…#198

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kerogers-cloudbees:container-startup

Commits on Oct 19, 2021

Add marker file via Dockerfile. Script will remove marker and exit if marker is present.
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Changes from PR. Move marker file out of init.groovy.d. Add and use new return value SKIPPING_FIRST_RUN.
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Use chown during copy to set ownership.
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