update github action

.github/workflows/bash_tester.yml

@@ -1,20 +1,27 @@
-name: Bash Script Tests
+name: ShellCheck
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
 
 jobs:
-  test:
+  shellcheck:
     runs-on: ubuntu-latest
 
     steps:
     - name: Checkout repository
       uses: actions/checkout@v2
 
-    - name: Set up Bash
+    - name: Install ShellCheck
-      run: |
+      run: sudo apt-get install -y shellcheck
-        sudo apt update
-        sudo apt install -y bash
 
-    - name: Run Bash script tests
+    - name: Run ShellCheck
-      run: |
+      run: shellcheck sh_scripts/*.sh
-        find . -type f -name "*.sh" -exec bash -n {} \;
+
+    - name: Report results
+      if: failure()
+      run: exit 1