add tester_workflow

.github/workflows/bash_tester.yml

@@ -0,0 +1,20 @@
+name: Bash Script Tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Set up Bash
+      run: |
+        sudo apt update
+        sudo apt install -y bash
+
+    - name: Run Bash script tests
+      run: |
+        find . -type f -name "*.sh" -exec bash -n {} \;