smoke ci configurations: add configurations to stetup fscache

Since using `/dev/cachefiles` requires sudo mode, so some environment variables are defined and we use `sudo -E` to pass these environment variables to sudo mode.

.github/workflows/smoke.yml

@@ -608,9 +608,26 @@ jobs:
         shared-key: nydus-build
     - name: Install cargo nextest
       uses: taiki-e/install-action@nextest
+    - name: Fscache Setup
+      run: |
+        sudo apt update
+        sudo apt install -y cachefilesd
+        sudo apt list --installed | grep cachefilesd
+        sudo chmod a+w /etc/default/cachefilesd
+        sudo sed -i 's/#RUN=yes/RUN=yes/' /etc/default/cachefilesd
+        sudo cat /etc/default/cachefilesd
+        sudo /sbin/modprobe -qab cachefiles
+        sudo /sbin/cachefilesd -f /etc/cachefilesd.conf
+        sudo systemctl status cachefilesd
+        [ -c /dev/cachefiles ] && echo "cachefilesd is successfully enabled"
+        pid=$(sudo lsof /dev/cachefiles | awk '{if (NR>1) {print $2}}')
+        sudo kill -9 $pid
+        echo "/dev/cachefiles is available now"
     - name: Unit Test
       run: |
-        make ut-nextest
+        CARGO_HOME=${HOME}/.cargo
+        CARGO_BIN=$(which cargo)
+        sudo -E CARGO=${CARGO_BIN} make ut-nextest
 
   nydus-unit-test-coverage:
     runs-on: ubuntu-latest
@@ -624,8 +641,26 @@ jobs:
           cache-on-failure: true
       - name: Install cargo-llvm-cov
         uses: taiki-e/install-action@cargo-llvm-cov
+      - name: Fscache Setup
+        run: |
+          sudo apt update
+          sudo apt install -y cachefilesd
+          sudo apt list --installed | grep cachefilesd
+          sudo chmod a+w /etc/default/cachefilesd
+          sudo sed -i 's/#RUN=yes/RUN=yes/' /etc/default/cachefilesd
+          sudo cat /etc/default/cachefilesd
+          sudo /sbin/modprobe -qab cachefiles
+          sudo /sbin/cachefilesd -f /etc/cachefilesd.conf
+          sudo systemctl status cachefilesd
+          [ -c /dev/cachefiles ] && echo "cachefilesd is successfully enabled"
+          pid=$(sudo lsof /dev/cachefiles | awk '{if (NR>1) {print $2}}')
+          sudo kill -9 $pid
+          echo "/dev/cachefiles is available now"
       - name: Generate code coverage
-        run: make coverage-codecov
+        run: |
+          CARGO_HOME=${HOME}/.cargo
+          CARGO_BIN=$(which cargo)
+          sudo -E CARGO=${CARGO_BIN} make coverage-codecov
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v3
         with: