ensure executing user owns Git repository for Debian build

Author: rcsanchez97

.evergreen/debian_package_build.sh

@@ -44,6 +44,7 @@ sudo -E ./debootstrap.git/debootstrap unstable ./unstable-chroot/ http://cdn-aws
 cp -a mongoc ./unstable-chroot/tmp/
 sudo chroot ./unstable-chroot /bin/bash -c "(\
   apt-get install -y build-essential git-buildpackage fakeroot debhelper cmake libssl-dev pkg-config python3-sphinx zlib1g-dev libicu-dev libsasl2-dev libsnappy-dev libzstd-dev libmongocrypt-dev && \
+  chown -R root:root /tmp/mongoc && \
   cd /tmp/mongoc && \
   git clean -fdx && \
   git reset --hard HEAD && \