Patch debrebuild to add sleep

[wbxyz]

This mitigates what seems to be a race condition in mmdebstrap, where the chroot isn't completely setup by the time our customize-hook runs.

[wbxyz]

Example failure before this patch

I: running --customize-hook in shell: sh -c 'chroot "$1" sh -c "mkdir -p /build/reproducible-path && dpkg-source --no-check -x /file_5.45-3.dsc /build/reproducible-path/file-5.45 && cd /build/reproducible-path/file-5.45 && { printf "%s" 'file (1:5.45-3+b1) sid; urgency=low, binary-only=yes

  * Binary-only non-maintainer upload for amd64; no source changes.
  * Rebuild for PAC/BTI support

 -- all / amd64 / i386 Build Daemon (x86-conova-01) <[email protected]>  Mon, 28 Oct 2024 17:55:16 +0000

'; cat debian/changelog; } > debian/changelog.debrebuild && mv debian/changelog.debrebuild debian/changelog && env DEB_BUILD_OPTIONS="parallel=6" LANG="C.UTF-8" LC_COLLATE="C.UTF-8" LC_CTYPE="C.UTF-8" SOURCE_DATE_EPOCH="1730138116" dpkg-buildpackage -uc -a amd64 --build=any && cd / && rm -r /build/reproducible-path/file-5.45"' exec /tmp/mmdebstrap.dHC_SGAmL8
chroot: failed to run command ‘sh’: Permission denied
E: setup failed: E: command failed: chroot "$1" sh -c "mkdir -p /build/reproducible-path && dpkg-source --no-check -x /file_5.45-3.dsc /build/reproducible-path/file-5.45 && cd /build/reproducible-path/file-5.45 && { printf "%s" 'file (1:5.45-3+b1) sid; urgency=low, binary-only=yes

  * Binary-only non-maintainer upload for amd64; no source changes.
  * Rebuild for PAC/BTI support

 -- all / amd64 / i386 Build Daemon (x86-conova-01) <[email protected]>  Mon, 28 Oct 2024 17:55:16 +0000

'; cat debian/changelog; } > debian/changelog.debrebuild && mv debian/changelog.debrebuild debian/changelog && env DEB_BUILD_OPTIONS="parallel=6" LANG="C.UTF-8" LC_COLLATE="C.UTF-8" LC_CTYPE="C.UTF-8" SOURCE_DATE_EPOCH="1730138116" dpkg-buildpackage -uc -a amd64 --build=any && cd / && rm -r /build/reproducible-path/file-5.45"
W: hooklistener errored out: E: received eof on socket

I: main() received signal PIPE: waiting for setup...
I: removing tempdir /tmp/mmdebstrap.dHC_SGAmL8...
E: mmdebstrap failed to run
mmdebstrap failed