add caching for CI workflow as well

Author: connortsui20

.github/workflows/CI.yaml

@@ -36,6 +36,8 @@ jobs:
         with:
           profile: minimal
           components: rustfmt, clippy
+      # Make sure to use cached compilation objects if they exist.
+      - uses: Swatinem/rust-cache@v2
       - name: Check code format
         uses: actions-rs/cargo@v1
         with:

.github/workflows/tpch.yaml

@@ -48,4 +48,4 @@ jobs:
           fail-on-alert: true
           alert-comment-cc-users: "@connortsui20"
           # Push to dedicated benchmark result repository.
-          gh-repository: "https://github.com/cmu-db/optd-benchmark"
+          gh-repository: "github.com/cmu-db/optd-benchmark"