Avoid new "out of disk space" issues in CI

Our 1.63 build on Ubuntu has been failing for quite some time
because it runs out of disk space trying to build tests in the last
cfg-flag steps. Thus, we add a few new `cargo clean`s here to fix
it.

diff --git a/ci/ci-tests.sh b/ci/ci-tests.sh
index 59acb833f1f2d4fe5d7b35a03ef835bb1f682e85..5cae6d45de5f56a778fc95b2e78b5c5fd9f5ffb6 100755 (executable)
--- a/ci/ci-tests.sh
+++ b/ci/ci-tests.sh
@@ -173,5 +173,7 @@ fi
 
 echo -e "\n\nTest cfg-flag builds"
 RUSTFLAGS="--cfg=taproot" cargo test --verbose --color always -p lightning
+[ "$CI_MINIMIZE_DISK_USAGE" != "" ] && cargo clean
 RUSTFLAGS="--cfg=async_signing" cargo test --verbose --color always -p lightning
+[ "$CI_MINIMIZE_DISK_USAGE" != "" ] && cargo clean
 RUSTFLAGS="--cfg=dual_funding" cargo test --verbose --color always -p lightning