Set umask when initializing DebBinaries

Christian Kastnerrequested to merge
ckk/autopkgtest:umask-fix into master

When supplying autopkgtest with built binaries (-B) and using the autopkgtest-virt-podman server, a umask of 0027 will lead to an early failure, aborting the test.

Closes: #1032487

Edited by Christian Kastner

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