ci: bring back build tests (#1813)

This directory was deleted when `cargo hack` was introduced, however
there were some tests that were still useful (macro failure output).

Also, additional build tests will be added over time.

1 files changed, 2 insertions, 0 deletions

diff --git a/tests-build/src/lib.rs b/tests-build/src/lib.rs
new file mode 100644
index 00000000..7b019cc7
--- /dev/null
+++ b/tests-build/src/lib.rs
@@ -0,0 +1,2 @@
+#[cfg(feature = "tokio")]
+pub use tokio;