Add logging

Author: guusw

.github/workflows/build-linux.yml

@@ -128,7 +128,7 @@ jobs:
           ./shards new ../shards/tests/snappy.shs
           ./shards new ../shards/tests/expect.shs
           ./shards new ../shards/tests/failures.shs
-          ./shards new ../shards/tests/wasm.shs
+          LOG_SHARDS=trace ./shards new ../shards/tests/wasm.shs
           ./shards new ../shards/tests/rust.shs
           ./shards new ../shards/tests/crypto.shs
           ./shards new ../shards/tests/wire-macro.shs