Add support for heredocs in the ONBUILD command #2209
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This start to address some of #2170, extending heredoc support into the
ONBUILDcommand. This pretty much just lets heredocs work exactly as expected when combined withONBUILD.With this structure, it should be possible to extend this in the future to
HEALTHCHECK, however, we'd need some support for heredocs inCMD(which I think works nicer in a separate PR, since it's actually unrelated to this).