cargo clean so we don't run out of disk space on benchmarks!

Author: sam0x17

.github/workflows/check-rust.yml

@@ -108,6 +108,10 @@ jobs:
         run: |
           cargo test --tests
 
+      # so we don't run out of disk space!
+      - name: cargo clean
+        run: cargo clean
+
       - name: Run benchmarks
         # timeout-minutes: 30
         run: |