Add github actions for shell check

.github/workflows/check_shell_script.yml

@@ -0,0 +1,22 @@
+name: Check Shell Script Syntax
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/[email protected]
+    - name: Get Diff Action
+      uses: technote-space/[email protected]
+      with:
+        SUFFIX_FILTER: .sh
+    - name: Install ShellCheck
+      run: |
+        sudo apt-get install shellcheck
+      if: env.GIT_DIFF
+    - name: Lint with ShellCheck
+      run: |
+        shellcheck --shell=bash -x ${{ env.GIT_DIFF }}
+      if: env.GIT_DIFF