add shellcheck workflow (#1147)

* add shellcheck workflow

* add shellcheck workflow

* Shellcheck to fail only with error severity

---------

Co-authored-by: Keyan <34140557+huumn@users.noreply.github.com>

.github/workflows/shell-check.yml

@@ -0,0 +1,17 @@
+name: ShellCheck
+
+on: [pull_request]
+
+jobs:
+  shellcheck:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Shellcheck
+      uses: actions/checkout@v3
+
+    - name: Run ShellCheck
+      uses: ludeeus/action-shellcheck@master
+      with:
+        severity: error 
+        scandir: ./sndev