ci: add Shell script linter (#9)

Author: ashishb

.github/workflows/lint-shell-script.yaml

@@ -0,0 +1,46 @@
+# Generated by Gabo (https://github.com/ashishb/gabo)
+---
+# Run this locally with act - https://github.com/nektos/act
+# act -j lintShellScript
+name: Lint Shell scripts
+
+on:  # yamllint disable-line rule:truthy
+  push:
+    branches: [main, master]
+    paths:
+      - "**.sh"
+      - "**.bash"
+      - ".github/workflows/lint-shell-script.yaml"
+  pull_request:
+    branches: [main, master]
+    paths:
+      - "**.sh"
+      - "**.bash"
+      - ".github/workflows/lint-shell-script.yaml"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+# Ref: https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/controlling-permissions-for-github_token
+permissions:
+  contents: read
+
+jobs:
+
+  lintShellScript:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Remove some files
+        # These are some code files that fails shell lint and we don't want to modify these
+        run: rm './braintest_or_ghostpush/tsnef(pessword)/post.sh'
+
+      - name: Run ShellCheck
+        uses: ludeeus/action-shellcheck@2.0.0