install hwloc in CI

Author: willcl-ark

.github/workflows/test.yml

@@ -27,6 +27,9 @@ jobs:
         uses: dtolnay/rust-toolchain@master
         with:
           toolchain: ${{ matrix.toolchain }}
+      - name: Install hwloc
+        run: |
+          sudo apt update && sudo apt install hwloc
       - name: cargo generate-lockfile
         run: cargo generate-lockfile
       - name: cargo test --locked