Add COSA_RPMOSTREE_GDB env, change to COSA_RPMOSTREE_ARGS
The first is useful for `env COSA_RPMOSTREE_GDB="gdb --args"`.  Make
the name of the second consistent.
@@ -224,9 +224,9 @@ EOF
rm -f "${changed_stamp}"
# shellcheck disable=SC2086
- set - rpm-ostree compose tree --repo="${workdir}"/repo \
+ set - ${COSA_RPMOSTREE_GDB:-} rpm-ostree compose tree --repo="${workdir}"/repo \
--cachedir="${workdir}"/cache --touch-if-changed "${changed_stamp}" \
- --unified-core "${manifest}" ${RPMOSTREE_EXTRA_ARGS:-} "$@"
+ --unified-core "${manifest}" ${COSA_RPMOSTREE_ARGS:-} "$@"
echo "Running: $*"
