build: set permission bits when we tar dockerfile into docker context #3594
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a user had an issue copying
.(in their container) into a volume: they got permission errors b/c we tar in the dockerfile with no permission bits. this PR sets permissions arbitrarily to 0644.we tar in the dockerfile b/c docker requires that the dockerfile exist somewhere in the archive. the idea solution here would be to replicate Docker's behavior of putting the Dockerfile somewhere random in the context such that it's in the archive (as is needed for building the image) but doesn't get copied into the container if the user runs
COPY . ....