[improve][build] Support git worktree working directory while building docker images #22851
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Motivation
git supports sharing a single local directory across multiple working directories as explained in https://pulsar.apache.org/contribute/setup-git/#checking-out-each-pulsar-maintenance-branch-in-a-separate-working-directory . This makes it easier to maintain multiple Pulsar branches since each maintenance branch will be checked out in it's own working directory and could be open simultaneously in IntelliJ.
However, building docker images has been broken when using
git worktree
working directory. This is fixed with this PR.Modifications
Documentation
doc
doc-required
doc-not-needed
doc-complete