During build-time tests, bwrap doesn't necessarily work. In particular,
official Debian autobuilders can't enter namespaces.
We continue to leave the sandbox enabled in the build-export calls in
tests/test-extensions.sh, tests/test-unsigned-summaries.sh
and tests/test-update-remote-configuration.sh, which are already
skipped if bwrap isn't available. This means we exercise both the
normal and --disable-sandbox code paths.
Signed-off-by: Simon McVittie <smcv@debian.org>
Closes: #2661
Approved by: alexlarsson