add github actions for lint tests

.github/workflows/lint_test.yml

@@ -0,0 +1,55 @@
+name: syntax check
+
+on:
+  schedule:
+    - cron:  '* 9 * * *'
+
+jobs:
+  python-lint:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v1
+    - name: Setup Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: 2.7
+    - name: Install Flake
+      run: |
+        python2 -m pip install flake8 pylint
+    - name: Lint with flake8
+      run: |
+        # stop the build if there are Python syntax errors or undefined names
+        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+    - name: Lint with pylint
+      run: |
+        pylint **/*.py
+
+  shell-lint:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v1
+    - name: Install ShellCheck
+      run: |
+        sudo apt-get install shellcheck
+    - name: Lint with ShellCheck
+      run: |
+        shellcheck --shell=bash -x $(find ./ -iname "*.sh")
+
+  json-lint:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v1
+    - name: Install node
+      run: |
+        sudo apt install nodejs
+    - name: Install jsonlint
+      run: |
+        sudo npm install -g jsonlint
+    - name: Lint with jsonlint
+      run: |
+        for file in $(find ./ -iname "*.json"); do jsonlint $file; done