Revert cpp test workflow to use vm build

.github/workflows/ci-cpp.yaml

@@ -31,17 +31,38 @@ jobs:
   cpp-tests:
     name:
     runs-on: ubuntu-latest
-    container:
-      image: apachepulsar/pulsar-build:latest
     timeout-minutes: 120
 
     steps:
+
       - name: checkout
         uses: actions/checkout@v2
         with:
           fetch-depth: 0
           ref: ${{ github.event.pull_request.head.sha }}
 
+      - name: Cache local Maven repository
+        uses: actions/cache@v2
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        if: steps.docs.outputs.changed_only == 'no'
+        with:
+          java-version: 1.8
+
+      - name: clean disk
+        run: |
+          sudo swapoff -a
+          sudo rm -f /swapfile
+          sudo apt clean
+          docker rmi $(docker images -q) -f
+          df -h
+
       - name: build package
         run: mvn -B -ntp -q install -Pcore-modules -DskipTests