Test the nightly build.

Signed-off-by: ChenYing Kuo <[email protected]>

.github/workflows/x-build.yaml

@@ -55,7 +55,7 @@ jobs:
         with:
           toolchain: ${{ env.RUST_TOOLCHAIN }}
           targets: "${{ matrix.target }}"
-      - uses: Swatinem/rust-cache@v2
+      #- uses: Swatinem/rust-cache@v2
       # Using nextest because it's faster than built-in test
       - uses: taiki-e/install-action@nextest