Merge pull request #172 from wangnuannuan/jingru-modify-action

action: submodule checkout freertos

Author: wangnuannuan

.github/workflows/examples-build.yml

@@ -23,6 +23,8 @@ jobs:
     steps:
     - name: checkout
       uses: actions/checkout@v2
+      with: 
+        submodules: true
 
     - name: install-dependencies
       run: |
@@ -42,6 +44,8 @@ jobs:
     steps:
     - name: checkout
       uses: actions/checkout@v2
+      with: 
+        submodules: true
 
     - name: install-dependencies
       run: |
@@ -61,6 +65,8 @@ jobs:
     steps:
     - name: checkout
       uses: actions/checkout@v2
+      with: 
+        submodules: true
 
     - name: install-dependencies
       run: |
@@ -79,6 +85,8 @@ jobs:
     steps:
     - name: checkout
       uses: actions/checkout@v2
+      with: 
+        submodules: true
 
     - name: install-dependencies
       run: |
@@ -97,6 +105,8 @@ jobs:
     steps:
     - name: checkout
       uses: actions/checkout@v2
+      with: 
+        submodules: true
 
     - name: install-dependencies
       run: |
@@ -115,6 +125,8 @@ jobs:
     steps:
     - name: checkout
       uses: actions/checkout@v2
+      with: 
+        submodules: true
 
     - name: install-dependencies
       run: |
@@ -133,6 +145,8 @@ jobs:
     steps:
     - name: checkout
       uses: actions/checkout@v2
+      with: 
+        submodules: true
 
     - name: install-dependencies
       run: |