update coverage.yml

Author: zjb0807

.github/workflows/coverage.yml

@@ -46,7 +46,7 @@ jobs:
         run: |
           wget https://github.com/xd009642/tarpaulin/releases/download/${{ env.TARPAULIN_VERSION }}/cargo-tarpaulin-x86_64-unknown-linux-musl.tar.gz
           tar -zxvf cargo-tarpaulin-x86_64-unknown-linux-musl.tar.gz -C $HOME/.cargo/bin
-          cargo tarpaulin -v --workspace \
+          cargo tarpaulin -v --force-clean --workspace \
             -e \
             acala acala-cli acala-service \
             acala-primitives \