fix actions/checkout@v2 problem (#2095)

.github/workflows/ci_backend.yml

@@ -46,6 +46,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      # In the checkout@v2, it doesn't support git submodule. Execute the commands manually.
+      - name: checkout submodules
+        shell: bash
+        run: |
+          git submodule sync --recursive
+          git -c protocol.version=2 submodule update --init --force --recursive --depth=1
       - name: Set up JDK 1.8
         uses: actions/setup-java@v1
         with:
@@ -56,6 +62,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      # In the checkout@v2, it doesn't support git submodule. Execute the commands manually.
+      - name: checkout submodules
+        shell: bash
+        run: |
+          git submodule sync --recursive
+          git -c protocol.version=2 submodule update --init --force --recursive --depth=1
       - name: Set up JDK 1.8
         uses: actions/setup-java@v1
         with:

.github/workflows/ci_e2e.yml

@@ -30,6 +30,12 @@ jobs:
     steps:
 
       - uses: actions/checkout@v2
+      # In the checkout@v2, it doesn't support git submodule. Execute the commands manually.
+      - name: checkout submodules
+        shell: bash
+        run: |
+          git submodule sync --recursive
+          git -c protocol.version=2 submodule update --init --force --recursive --depth=1
       - uses: actions/cache@v1
         with:
           path: ~/.m2/repository

.github/workflows/ci_frontend.yml

@@ -35,6 +35,12 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     steps:
       - uses: actions/checkout@v2
+      # In the checkout@v2, it doesn't support git submodule. Execute the commands manually.
+      - name: checkout submodules
+        shell: bash
+        run: |
+          git submodule sync --recursive
+          git -c protocol.version=2 submodule update --init --force --recursive --depth=1
       - name: Set up Node.js
         uses: actions/setup-node@v1
         with:
@@ -50,6 +56,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      # In the checkout@v2, it doesn't support git submodule. Execute the commands manually.
+      - name: checkout submodules
+        shell: bash
+        run: |
+          git submodule sync --recursive
+          git -c protocol.version=2 submodule update --init --force --recursive --depth=1
       - name: Set up JDK 1.8
         uses: actions/setup-java@v1
         with:

.github/workflows/ci_ut.yml

@@ -30,6 +30,12 @@ jobs:
     steps:
 
       - uses: actions/checkout@v2
+      # In the checkout@v2, it doesn't support git submodule. Execute the commands manually.
+      - name: checkout submodules
+        shell: bash
+        run: |
+          git submodule sync --recursive
+          git -c protocol.version=2 submodule update --init --force --recursive --depth=1
       - uses: actions/cache@v1
         with:
           path: ~/.m2/repository